Towns and Countries in English and Welsh
In Wales - Official documentation including roadsigns are normally provided in both the Welsh and English languages1. You usually find Welsh first and English second.
In order to keep the list down to a manageable size, I have not included locations which use the same name in both languges.
The spelling of some Welsh words can change slighty, depending on the context of a sentence. However, they are usually "close enough" for a non native speaker to find the correct entry in this list. Here is an example - The town
with the English name of "Pembroke" has
two possible Welsh translations - either "Penfro" or "Benfro"
The list below provides a handy translation tool for Place Names, Towns and Countries.
| Welsh | English form |
| Abaty Cwm-hir | Abbey Cwm-hir |
| Aber-bach | Little Haven |
| Aberbargod | Aberbargoed |
| Aberbîg | Aberbeeg |
| Aberchwiler | Aberwheeler |
| Aber-craf | Abercrave |
| Abercynffig | Aberkenfig |
| Aberdâr | Aberdare |
| Aberdaugleddau | Milford Haven |
| Aberfal | Falmouth |
| Aberglasne | Aberglasney |
| Abergwaun | Fishguard |
| Abergwenffrwd | Whitebrook |
| Aberhonddu | Brecon |
| Aberllydan | Broad Haven |
| Aberllynfi | Three Cocks |
| Aber-miwl | Abermule |
| Aberogwr | Ogmore-by-sea |
| Aberpennar | Mountain Ash |
| Aberplym | Plymouth |
| Aberriw | Berriew |
| Abertawe | Swansea |
| Aberteifi | Cardigan |
| Abertyleri | Abertillery |
| Acstyn | Axton |
| Affganistan | Afghanistan |
| Afon Gweryd | Forth river |
| Allteuryn | Goldcliff |
| Alltmelyd | Meliden |
| Amwythig | Shrewsbury |
| Antigua a Barbuda | Antigua and Barbuda |
| Arberth | Narberth |
| Ardd-lin | Arddleen |
| Awstralia | Australia |
| Awstria | Austria |
| Bae Cinmel | Kinmel Bay |
| Bae Colwyn | Colwyn Bay |
| Bangor Is-coed | Bangor-on-Dee |
| Bangor Uchaf | Upper Bangor |
| Bargod | Bargoed |
| Bedwellte | Bedwellty |
| Begeli | Begelly |
| Belarws | Belarus |
| Belffast | Belfast |
| Bers | Bersham |
| Biwmares | Beaumaris |
| Blaenau | Blaina |
| Blaendulais | Seven Sisters |
| Blaen-y-cwm | Mountain Air |
| Bochrwyd | Boughrood |
| Bosnia a Herzegovina | Bosnia and Herzegovina |
| Bracla | Brackla |
| Bradle | Bradley |
| Brasil | Brazil |
| Breudeth | Brawdy |
| Brychdwn | Broughton |
| Bryn Bach | Bache Hill |
| Brynaman Isaf | Lower Brynaman |
| Brynbuga | Usk |
| Brynffordd | Brynford |
| Brynhyfryd | Summerhill |
| Bryste | Bristol |
| Bugeildy | Beguildy |
| Bwcle | Buckley |
| Bwlgaria | Bulgaria |
| Caer | Chester |
| Caercolyn | Colchester |
| Caerdydd | Cardiff |
| Caerfaddon | Bath |
| Caerferes | Dumfries |
| Caerffili | Caerphilly |
| Caerfuddai | Chichester |
| Caerfyrddin | Carmarthen |
| Caergaint | Canterbury |
| Caergrawnt | Cambridge |
| Caergybi | Holyhead |
| Caerhirfryn | Lancaster |
| Caeriw | Carew |
| Caerliwelydd | Carlisle |
| Caerllion | Caerleon |
| Caerloyw | Gloucester |
| Caerlwytgoed | Lichfield |
| Caerlŷr | Leicester |
| Caermincip | Saint Albans |
| Caersallog | Salisbury |
| Caerwrangon | Worcester |
| Caerwrygion | Wroxeter |
| Caerwyntr | Winchester |
| Caerwysg | Exeter |
| Caint | Kent |
| Cantref Coch | Forest of Dean |
| Capel Isaf | Lower Chapel |
| Capel Newydd | Newchapel |
| Capel Uchaf | Upper Chapel |
| Carneddau Teon | The Stiperstones |
| Cas-bach | Castleton |
| Cas-fuwch | Castlebythe |
| Cas-gwent | Chepstow |
| Cas-lai | Hayscastle |
| Casllwchwr | Loughor |
| Cas-mael | Puncheston |
| Casmorys | Castle Morris |
| Casnewydd | Newport (Gwent) |
| Casnewydd-bach | Little Newcastle |
| Castell Caereinion | Castle Caereinion |
| Castellmartin | Castlemartin |
| Castell-nedd | Neath |
| Castellnewydd | Newcastle |
| Castellnewydd Emlyn | Newcastle Emlyn |
| Castell-paen | Painscastle |
| Cas-wis | Wiston |
| Catffrwd | Catbrook |
| Catraeth | Catterick |
| Cefn Hirfynydd | Long Mynd |
| Cefn Mabli | Cefn Mably |
| Cefn-y-pant | Pantside |
| Cegidfa | Guilsfield |
| Cei Connah | Connah's Quay |
| Cei Lawrenni | Lawrenny Quay |
| Ceinewydd | New Quay |
| Ceintun | Kington |
| Cei’r Trallwng | Pool Quay |
| Celstryn | Kelsterton |
| Cemais Comawndwr | Kemeys Commander |
| Cemais Isaf | Kemeys Inferior |
| Cendl | Beaufort |
| Ceri | Kerry |
| Cernyw | Cornwall |
| Chwitffordd | Whitford |
| Cilâ | Killay |
| Cilâ Uchaf | Upper Killay |
| Cilfái | Kilvey |
| Cilgeti | Kilgetty |
| Cilgwri | Wirral |
| Cil-y-coed | Caldicot |
| Ciwba | Cuba |
| Cledan | Cleddon |
| Cleidda | Clytha |
| Cleirwy | Clyro |
| Clud | Clyde |
| Clun | Clyne |
| Cnwclas | Knucklas |
| Coed Gwent | Wentwood |
| Coedcernyw | Coedkernew |
| Coed-duon | Blackwood |
| Coedelái | Coed-ely |
| Coed-llai | Leeswood |
| Coedybrenin | Kingswood |
| Coed-yr-iarll | Earlswood |
| Coety | Coity |
| Cofentri | Coventry |
| Comin Llanddinol | Itton Common |
| Comin Llanfihangel Troddi | Mitchel Troy Common |
| Congo Gweriniaeth Ddemocrataidd | Democratic Republic of Congo |
| Côr y Cewri | Stonehenge |
| Corneli Waelod | South Cornelly |
| Corntwn | Corntown |
| Creseli | Cresselly |
| Croes Cas-lai | Haycastle Cross |
| Croes Cwrlwys | Culverhouse Cross |
| Croesoswallt | Oswestry |
| Crucadarn | Crickadarn |
| Crucywel | Crickhowell |
| Crug | Crick |
| Crugion | Criggion |
| Crymlyn | Crumlin |
| Crynwedd | Crinow |
| Cryw | Crewe |
| Cwmbrân Uchaf | Upper Cwmbran |
| Cwmclydach | Clydach Vale |
| Cwmdâr | Cwmdare |
| Cwmheiob | Cwmheyope |
| Cwm-iou | Cwmyoy |
| Cwmogwr | Ogmore Vale |
| Cwm-twrch Isaf | Lower Cwm-twrch |
| Cwm-twrch Uchaf | Upper Cwm-twrch |
| Cwmtyleri | Cwmtillery |
| Cyffordd Llandudno | Llandudno Junction |
| Cynffig | Kenfig |
| De Affrica | South Africa |
| De Georgia | South Georgia |
| De Korea | South Korea |
| De Sudan | South Sudan |
| Denmarc | Denmark |
| Derwen-fawr | Broad Oak |
| Derwen-gam | Oakford |
| Din Gwrygon | The Wrekin |
| Dinas Eidyn | Edinburgh |
| Dinas y Deri | Derry (Londonderry) |
| Dinas y Fatican | Vatican City |
| Dinas y Garrai | Doncaster |
| Dinbych | Denbigh |
| Dinbych-y-pysgod | Tenby |
| Doc Penfro | Pembroke Dock |
| Doc y Barri | Barry Dock |
| Dofr | Dover |
| Domen Ddu | Black Mixen |
| Drenewydd Gelli-farch | Shirenewton |
| Dŵr Cwmwdig | Cwmwdig Water |
| Dwyrain Aberddawan | East Aberthaw |
| Dwyrain Canolbarth Lloegr | East Midlands |
| Dwyrain Timor | East Timor |
| Dyfnaint | Devon |
| Dyfnant | Dunvant |
| Dyrham | Durham |
| Efrog | York |
| Eglwys Fair y Mynydd | Saint Mary Hill |
| Eglwys Newydd | Newchurch (Blaenau Gwent) |
| Eglwys Wythwr | Monington |
| Eglwys y Drindod | Christchurch |
| Einsiob | Evenjobb |
| Eneu'r-glyn | Energlyn |
| Erbistog | Erbistock |
| Ergyng | Archenfield |
| Erwyd | Erwood |
| Eryri | Snowdonia |
| Eutun | Eyton |
| Faenor | Vaynor |
| Faerdre | Vardre |
| Felinganol | Middle Mill |
| Felin-newydd | New Mills |
| Ffiji | Fiji |
| Ffordun | Forden |
| Ffrainc | France |
| Ffrwd Glyn-hir | Glyn-hir Waterfall |
| Ffwl-y-mwn | Fonmon |
| Ffwrnais | Furnace |
| Ffynnon Taf | Taff's Well |
| Ffynnon-groes | Crosswell |
| Fietnam | Vietnam |
| Gelli-aur | Golden Grove |
| Gellifedw | Birchgrove |
| Glan-bad | Upper Boat |
| Glandŵr | Landore |
| Glan-miwl | Glan-mule |
| Glannau Merswy | Merseyside |
| Glantwymyn | Cemaes Road |
| Glanyfferi | Ferryside |
| Glan-y-môr | Seaside |
| Glanyrafon | Riverside |
| Glyn Nant-y-glo | Coalbrookvale |
| Glynebwy | Ebbw Vale |
| Glyn-nedd | Glynneath |
| Glynrhedynog | Ferndale |
| Goetre-hen | Coytrahen |
| Gogledd Corneli | North Cornelly |
| Gogledd Korea | North Korea |
| Gogledd Macedonia | North Macedonia |
| Gorllewin Aberddawan | West Aberthaw |
| Gorllewin Canolbarth Lloegr | West Midlands |
| Gresffordd | Gresford |
| Guinea Gyhydeddol | Equatorial Guinea |
| Gwaeddel | Weythel |
| Gwaunyterfyn | Acton |
| Gwenfô | Wenvoe |
| Gwenlloc | Much Wenlock |
| Gweriniaeth Canolbarth Affrica | Central African Republic |
| Gweriniaeth Dominica | Dominican Republic |
| Gwlad Belg | Belgium |
| Gwlad Groeg | Greece |
| Gwlad Pwyl | Poland |
| Gwlad Thai | Thailand |
| Gwlad yr Iâ | Iceland |
| Gwlad yr Iorddonen | Jordan |
| Gwlad-yr-haf | Somerset |
| Gwndy | Undy |
| Halchdyn | Halghton |
| Hawy | Howey |
| Helygain | Halkyn |
| Hen Golwyn | Old Colwyn |
| Hen Ystog | Old Churchstoke |
| Hendy-gwyn ar Daf | Whitland |
| Henffordd | Hereford |
| Hengastell | Oldcastle |
| Henlland | Hentland |
| Heol Abertawe | Swansea Road |
| Hwlffordd | Haverfordwest |
| Hwmbr | Humber |
| Hwngari | Hungary |
| Hwytyn | Whitton |
| Hywig | Howick |
| Irac | Iraq |
| Isatyn | Hyssington |
| Iwerddon | Ireland |
| Lacharn | Laugharne |
| Landimôr | Landimore |
| Larnog | Lavernock |
| Latfia | Latvia |
| Lawrenni | Lawrenny |
| Lecwydd | Leckwith |
| Lerpwl | Liverpool |
| Libanus | Lebanon |
| Lithwania | Lithuania |
| Llai | Llay |
| Llanandras | Presteigne |
| Llanarfan | Saint Arvans |
| Llanbedr Felffre | Lampeter Velfrey |
| Llanbedr Pont Steffan | Lampeter |
| Llanbedr-y-fro | Peterston-super-Ely |
| Llanbugnal | Ballingham |
| Llanbydderi | Llanbethery |
| Llancatal | Llancadle |
| Llancein | Kentchurch |
| Llancrug | Kenderchurch |
| Llanddewi Cil Peddeg | Kilpeck |
| Llanddewi Felffre | Llanddewi Velfrey |
| Llanddewi Nant Hodni | Llanthony |
| Llanddewi Ysgyryd | Llanddewi Skirrid |
| Llanddingad | Dingestow |
| Llanddinol | Itton |
| Llanddunwyd | Welsh Saint Donats |
| Llandeglau | Llandegley |
| Llandeilo Bertholau | Llantilio Pertholey |
| Llandeilo Ferwallt | Bishopston |
| Llandeilo Gresynni | Llantilio Crossenny |
| Llandewi | Much Dewchurch |
| Llandochau | Llandough |
| Llandrillo-yn-Rhos | Rhos-on-Sea |
| Llandrindod | Llandrindod Wells |
| Llandudoch | Saint Dogmaels |
| Llandudwg | Tythegston |
| Llandŵ | Llandow |
| Llandyfái | Lamphey |
| Llandysilio | Four Crosses |
| Llaneirwg | Saint Mellons |
| Llanelwy | Saint Asaph |
| Llaneurgain | Northop |
| Llanfable | Llanvapley |
| Llan-faes | Llanmaes |
| Llan-fair | Saint Mary Church |
| Llanfair Cilgedin | Llanfair Kilgeddin |
| Llanfair Llythynwg | Gladestry |
| Llanfair-ym-Muallt | Builth Wells |
| Llanfarthin | Llanmartin |
| Llanfeuthin | Llanvithyn |
| Llanffa | Llampha |
| Llan-ffwyst | Llanfoist |
| Llanffynhonwen | Chirbury |
| Llanfihangel Dyffryn Arwy | Michaelchurch-on-Arrow |
| Llanfihangel Troddi | Mitchel Troy |
| Llanfihangel y Bont-faen | Llanmihangel |
| Llanfihangel-ar-Elái | Michaelston-super-Ely |
| Llanfihangel-y-fedw | Michaelston-y-fedw |
| Llanfihangel-y-pwll | Michaelston-le-Pit |
| Llanfleiddan | Llanblethian |
| Llanfocha | Saint Maughans |
| Llangamarch | Llangamarch Wells |
| Llanganna | Llangan |
| Llangatwg | Llangattock |
| Llangatwg Dyffryn Wysg | Llangattock nigh Usk |
| Llangeinwyr | Llangeinor |
| Llangrallo | Coychurch |
| Llangynydd | Llangennith |
| Llangystennin Garth Brenni | Welsh Bicknor |
| Llanhari | Llanharry |
| Llanhiledd | Llanhilleth |
| Llanhuadain | Llawhaden |
| Llanilltud Faerdref | Llantwit Fardre |
| Llanilltud Fawr | Llantwit Major |
| Llanilltud Gŵyr | Ilston |
| Llanisan-yn-Rhos | Saint Ishmaels |
| Llanisien | Llanishen |
| Llanllieni | Leominster |
| Llanllŷr | Llanyre |
| Llan-lwy | Llandeloy |
| Llanmartin | Marstow |
| Llanmihangel | Michaelchurch |
| Llannerch Banna | Penley |
| Llannewydd | Newchurch (Carmarthenshire) |
| Llannewydd | Newchurch (Powys) |
| Llanofer Uchaf | Upper Llanofer |
| Llanrhymni | Llanrumney |
| Llansanffraid | Bridstow |
| Llansanffraid Gwynllŵg | Saint Brides Wentloog |
| Llansanffraid-ar-Elái | Saint Brides-super-Ely |
| Llansangwenardd | Saint Weonards |
| Llansansiôr | Saint George |
| Llansanwyr | Llansannor |
| Llansawel | Briton Ferry |
| Llansulac | Sellack |
| Llantiuoi | Foy |
| Llanwarw | Wonastow |
| Llanwrtyd | Llanwrtyd Wells |
| Llanwynell | Wolvesnewton |
| Llanwytherin | Llanvetherine |
| Llanymddyfri | Llandovery |
| Llan-y-tair-mair | Knelston |
| Llidiard | Litchard |
| Lloegr | England |
| Llongborth | Portsmouth |
| Llundain | London |
| Llwydlo | Ludlow |
| Llwyncelyn | Hollybush |
| Llwyneliddon | Saint Lythans |
| Llwynhelyg | Withybush |
| Llwyni | Lloyney |
| Llyn Llumonwy | Loch Lomond |
| Llyncwlen | Lincoln |
| Llynpenmaen | Penmaen-pwl |
| Llys-faen | Lisvane |
| Llyswyrny | Llysworney |
| Llyswyry | Lliswerry |
| Lwcsembwrg | Luxembourg |
| Machen Isaf | Lower Machen |
| Maenorbŷr | Manorbier |
| Maerun | Marshfield |
| Maes-glas | Greenfield |
| Maes-y-coed | Woodfieldside |
| Maesycwmwr | Maesycwmer |
| Maesyfed | New Radnor |
| Maesyffynnon | Springfield |
| Magwyr | Magor |
| Manceinion | Manchester |
| Manceinion Fwyaf | Greater Manchester |
| Marcroes | Marcross |
| Mecsico | Mexico |
| Meisgyn | Miskin |
| Melin Ifan Ddu | Blackmill |
| Melin-wynt | Windmill |
| Melltyn | Mellington |
| Merswy | Mersey |
| Merthyr Tudful | Merthyr Tydfil |
| Moldofa | Moldova |
| Môr Udd | English Channel |
| Morfa Baglan | Baglan Moors |
| Morfa Margam | Margam Moors |
| Moryd Gweryd | Firth of Forth |
| Mwynglawdd | Minera |
| Mynachlog Nedd | Neath Abbey |
| Mynwar | Mynwear |
| Mynwent y Crynwyr | Quakers Yard |
| Mynyddcynffig | Kenfig Hill |
| Mynydd-y-Fflint | Flint Mountain |
| Nanhyfer | Nevern |
| Niwbwrch | Newborough |
| Niwgwl | Newgale |
| Norwy | Norway |
| Notais | Nottage |
| Ogwr | Ogmore |
| Owrtyn | Overton |
| Pacistan | Pakistan |
| Pantygerdinen | Ashvale |
| Papua Guinea Newydd | Papua New Guinea |
| Parc Cathays | Cathays Park |
| Parc Cwmdoncyn | Cwmdonkin Park |
| Parc Hendredenny | Hendredenny Park |
| Parc Lansbury | Lansbury Park |
| Parc Victoria | Victoria Park |
| Parc Watford | Watford Park |
| Parc y Rhath | Roath Park |
| Parciau | Parkey |
| Patrisio | Partrishow |
| Pedair-hewl | Four Roads |
| Pen Pyrod | Worm's Head |
| Penalun | Penally |
| Penarlâg | Hawarden |
| Penarth Isaf | Lower Penarth |
| Penbedw | Birkenhead |
| Pencraig | Old Radnor |
| Pendeulwyn | Pendoylan |
| Penffordd-las | Staylittle |
| Penfro | Pembroke |
| Pengelli | Grovesend |
| Pen-hw | Pen-how |
| Penlle'r-brain | Ravenhill |
| Pen-marc | Penmark |
| Penrhudd | Penrith |
| Pen-rhys | Penrice |
| Pentre Elan | Elan Village |
| Pentre Helygain | Pentre Halkyn |
| Pentremeurig | Pentre Meyrick |
| Pentre-poeth | Morganstown |
| Pentre'r Eglwys | Church Village |
| Pentre'r-ardd | Garden Village |
| Pentywyn | Pendine |
| Penwynion | Pennines |
| Pen-y-bont ar Ogwr | Bridgend |
| Pen-y-bryn | Hilltop |
| Periw | Peru |
| Pilgwenlli | Pillgwenlly |
| Pont Arberth | Narberth Bridge |
| Pontarfynach | Devil's Bridge |
| Pontfadlen | Merlins Bridge |
| Pont-ffranc | Frank's Bridge |
| Pont-rhyd-y-bont | Four Mile Bridge |
| Pontsenni | Sennybridge |
| Pontybrenin | Kingsbridge |
| Pont-y-pŵl | Pontypool |
| Porth Tywyn | Burry Port |
| Porthaethwy | Menai Bridge |
| Porthceri | Porthkerry |
| Porthceri Isaf | Lower Porthkerry |
| Porthllechog | Bull Bay |
| Porthsgiwed | Portskewett |
| Portiwgal | Portugal |
| Post-mawr | Synod Inn |
| Prysg | Prisk |
| Pump-hewl | Five Roads |
| Pyllau Bedwellte | Bedwellty Pits |
| Radur | Radyr |
| Radur | Rhadyr |
| Ras Isaf | Lower Race |
| Ras Uchaf | Upper Race |
| Rhaeadr Gwy | Rhayader |
| Rhisga | Risca |
| Rhiwabon | Ruabon |
| Rhiwbeina | Rhiwbina |
| Rhiw'r-perrai | Ruperra |
| Rhos Fawr | Great Rhos |
| Rhosan-ar-Wy | Ross-on-Wye |
| Rhos-goch | Red Roses |
| Rhuthun | Ruthin |
| Rhydaman | Ammanford |
| Rhydgaled | Chancery |
| Rhydodyn | Edwinsford |
| Rhydri | Rudry |
| Rhyd-y-blew | Carmeltown |
| Rhydychen | Oxford |
| Rhymni | Rhymney |
| Rwmania | Romania |
| Rwsia | Russia |
| Sain Dunwyd | Saint Donats |
| Sain Ffagan | Saint Fagans |
| Sain Nicolas | Saint Nicholas (Vale of Glamorgan) |
| Sain Silian | Saint Julians |
| Sain Tathan | Saint Athan |
| Saint Andras | Saint Andrews Major |
| Saint Hilari | Saint Hilary |
| Saint-y-brid | Saint Brides Major |
| Saint-y-brid | Saint Brides Netherwent |
| San Steffan | Westminster |
| Sanclêr | Saint Clears |
| Sant Kitts a Nevis | Saint Kitts and Nevis |
| Sao Tome a Principe | Sao Tome and Principe |
| Sarc | Sark |
| Sbaen | Spain |
| Sbyty | Spytty |
| Seland Newydd | New Zealand |
| Sgeti | Sketty |
| Sgeti Isaf | Lower Sketty |
| Sgiwen | Skewen |
| Sgomer | Skomer |
| Sili | Sully |
| Silstwn | Gileston |
| Sirhywi | Sirhowy |
| Slebets | Slebech |
| Slofacia | Slovakia |
| Slofenia | Slovenia |
| Solfach | Solva |
| Solfach Isaf | Lower Solva |
| Solfach Uchaf | Upper Solva |
| Sonlli | Sontley |
| Swydd Amwythig | Shropshire |
| Swydd Efrog | Yorkshire |
| Swydd Gaer | Cheshire |
| Swydd Gaergrawnt | Cambridgeshire |
| Swydd Gaerhirfryn | Lancashire |
| Swydd Gaerloyw | Gloucestershire |
| Swydd Gaerlŷr | Leicestershire |
| Swydd Gaerwrangon | Worcestershire |
| Swydd Henffordd | Herefordshire |
| Swydd Rydychen | Oxfordshire |
| Swydd Warwig | Warwickshire |
| Tafwys | Thames |
| Talwrn Green | Tallarn Green |
| Tal-y-bont | Buttington |
| Tal-y-bont ar Wysg | Talybont-on-Usk |
| Talyllychau | Talley |
| Tiriogaeth Brydeinig Cefnfor India | British Indian Ocean Territory |
| Tiriogaeth Brydeinig yr Antarctig | British Antarctic Territory |
| Tonysguboriau | Talbot Green |
| Traeth Coch | Red Wharf Bay |
| Traeth Treco | Trecco Bay |
| Trannon | Trent |
| Tre Ioan | Johnstown |
| Treamlod | Ambleston |
| Trebedr | Peterborough |
| Trebefered | Boverton |
| Treberfedd | Middletown |
| Trecelyn | Newbridge |
| Tre-ddu | Blacktown |
| Tredegar Newydd | New Tredegar |
| Tredelerch | Rumney |
| Tredemel | Templeton |
| Tredŵr | Waterton |
| Tredynog | Tredunnock |
| Tref Elliot | Elliot's Town |
| Trefaldwyn | Montgomery |
| Trefansel | Manselton |
| Trefddyn | Trefethin |
| Trefdraeth | Newport (Pembrokeshire) |
| Trefechan | Trevaughan |
| Trefelen | Bletherston |
| Trefesgob | Bishop's Castle |
| Trefesgob | Bishton |
| Trefflemin | Flemingston |
| Treffynnon | Cheltenham |
| Treffynnon | Holywell |
| Trefoffeiriaid | Preston |
| Trefonnen | Nash |
| Treforys | Morriston |
| Trefwrdan | Jordanston |
| Trefyclo | Knighton |
| Trefynwy | Monmouth |
| Treganna | Canton |
| Tregatwg | Cadoxton |
| Tregetin | Keeston |
| Tre-goed | Tregoyd |
| Tregolwyn | Colwinston |
| Tre-groes | Whitchurch (Pembrokeshire) |
| Tregŵyr | Gowerton |
| Trehopcyn | Hopkinstown |
| Tre-hyl | Tre-hill |
| Trelái | Ely |
| Trelales | Laleston |
| Treletert | Letterston |
| Trelyn | Fleur-de-lis |
| Tremarchog | Saint Nicholas (Pembrokeshire) |
| Treopert | Granston |
| Tre'r-llai | Leighton |
| Tresalem | Robertstown |
| Tresigin | Sigingstone |
| Tresimwn | Bonvilston |
| Tretomas | Thomastown |
| Tretŵr | Tretower |
| Trewallter | Walterston |
| Trewiliam | Williamstown |
| Trewyddel | Moylgrove |
| Trinidad a Tobago | Trinidad and Tobago |
| Troedrhiw’r-clawdd | Victoria |
| Trwyn Larnog | Lavernock Point |
| Tryleg | Trellech |
| Tsiecia | Czechia |
| Tsieina | China |
| Twrci | Turkey |
| Twyndrysïog | Briery Hill |
| Tyddewi | Saint Davids |
| Tŷ-du | Rogerstone |
| Tyndyrn | Tintern |
| Ty'n-y-coedcae | Waterloo |
| Unol Daleithiau | United States |
| Warwig | Warwick |
| Wcráin | Ukraine |
| Wdig | Goodwick |
| Wlster | Ulster |
| Wrecsam | Wrexham |
| Y Bahamas | The Bahamas |
| Y Barri | Barry |
| Y Batel | Battle |
| Y Bermo | Barmouth |
| Y Bont-faen | Cowbridge |
| Y Bont-faen | Forge |
| Y Bontnewydd-ar-Wy | Newbridge on Wye |
| Y Borth Uchaf | Upper Borth |
| Y Clas | Clase |
| Y Clas-ar-Wy | Glasbury |
| Y Cocyd | Cockett |
| Y Crwys | Three Crosses |
| Y Cwar | The Quar |
| Y Dafarn Newydd | New Inn |
| Y Ddraenen | Thornhill |
| Y Ddraenen-wen | Hawthorn |
| Y Deyrnas Unedig | United Kingdom |
| Y Drenewydd | Bute Town |
| Y Drenewydd | Newtown |
| Y Fali | Valley |
| Y Fan | Van |
| Y Farteg | Varteg |
| Y Felin-wyllt | Wild Mill |
| Y Fenni | Abergavenny |
| Y Ffindir | Finland |
| Y Fflint | Flint |
| Y Gambia | The Gambia |
| Y Garn | Roch |
| Y Gelli Gandryll | Hay-on-Wye |
| Y Graig | The Rock |
| Y Groes | Crossgates |
| Y Grysmwnt | Grosmont |
| Y Maendy | Maindy |
| Y Mot | New Moat |
| Y Mynydd Bychan | Heath |
| Y Pîl | Pyle |
| Y Rhath | Roath |
| Y Rhws | Rhoose |
| Y Rhyl | Rhyl |
| Y Sblot | Splott |
| Y Sgwâr | Square and Compass |
| Y Swistir | Switzerland |
| Y Traeth Ifori | Ivory Coast |
| Y Trallwng | Welshpool |
| Y Transh | Tranch |
| Y Twyn | Dukestown |
| Y Tŷ Ogofog | Nottingham |
| Y Tyllgoed | Fairwater |
| Y Waun | Chirk |
| Y Waun | Gwernaffield |
| Y Wig | Wick |
| Ynys Bŷr | Caldey |
| Ynys Dewi | Ramsey |
| Ynys Enlli | Bardsey |
| Ynys Gwydrin | Glastonbury |
| Ynys Manaw | Isle of Man |
| Ynys Môn | Anglesey |
| Ynys Wair | Lundy |
| Ynys Wyth | Isle of Wight |
| Ynys y Barri | Barry Island |
| Ynys y Garn | Guernsey |
| Ynysgynwraidd | Skenfrith |
| Ynysoedd Cayman | Cayman Islands |
| Ynysoedd Erch | Orkney |
| Ynysoedd Falkland | Falkland Islands |
| Ynysoedd Heledd | Hebrides |
| Ynysoedd Marshall | Marshall Islands |
| Ynysoedd Philippines | Philippines |
| Ynysoedd Pitcairn | Pitcairn Islands |
| Ynysoedd Prydeinig y Wyryf | British Virgin Islands |
| Ynysoedd Sandwich y De | South Sandwich Islands |
| Ynysoedd Solomon | Solomon Islands |
| Ynysoedd Turks a Caicos | Turks and Caicos Islands |
| Ynysoedd y Sianel | Channel Islands |
| Ynysowen | Merthyr Vale |
| Yr Aifft | Egypt |
| Yr Alban | Scotland |
| Yr Almaen | Germany |
| Yr Ariannin | Argentina |
| Yr As Fawr | Monknash |
| Yr Eglwys Lwyd | Ludchurch |
| Yr Eglwys Newydd | Whitchurch (Cardiff) |
| Yr Eglwys Newydd ar y Cefn | Newchurch (Monmouthshire) |
| Yr Eidal | Italy |
| Yr Emiradau Arabaidd Unedig | United Arab Emirates |
| Yr Heledd Ddu | Northwich |
| Yr Heledd Wen | Nantwich |
| Yr Hôb | Hope |
| Yr Iseldiroedd | Netherlands |
| Yr Orsedd | Rossett |
| Yr Wyddfa | Snowdon |
| Yr Wyddgrug | Mold |
| Yr Ynys Hir | Isle of Skye |
| Yr Ystog | Churchstoke |
| Ystagbwll | Stackpole |
| Ystrad Clud | Strathclyde |
| Ystrad Fflur | Strata Florida |
| Ystum Taf | Llandaf North |
| Ystumllwynarth | Oystermouth |
Acknowledgements
- This list is based on data © Welsh Language Commissioner (2018) This list is licenced under the Open Government Licence 3.0 except where otherwise stated. Contains OS data © Crown copyright and database right 2018.
- This list also includes data from the The NaPTAN (Public Transport) dataset is published under the Open Government Licence
- This list may include errors/omissions, please let me know about any problems
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