Cymru am byth ! (Wales for ever), as they say in the local tongue.
Porthmadog, Wales, UK
(this, and the preceding four, are all within a 40-mile-diameter circle vis-a-vis each other).
At the risk of being a “know-it-all Limey” – keeping us in Wales –
Queensferry, Wales, UK
(English name, but in Wales [just] – near the Principality’s north-eastern extremity).
Can a Filipino-Russian continue this? (trying to be apologetic for not being a Limey) 
Rhoscefnhir Wales GBR
Interesting place names, there in Wales!
Senghenydd, Wales, UK
Teterboro, NJ, USA
Ust-Kamenogorsk, Kazakhstan
Welsh “run” got up to eight entries; but Annie-Xmas shot the Cymric upstarts down in flames.
Valdepeñas, Spain
Yeah, well, I don’t think it would’ve gotten past X. And I checked the Wales map, too.
Xaxaba BWA
Truly – per my (quite detailed) road atlas, there are no places beginning with X, anywhere in Great Britain.
Looks like you’ve skipped over W. How about –
Walkaway, Western Australia, Australia
Yucca Valley, California, USA
DAMN. That’s twice!!!
Zamboanga, Philippines
Addis Ababa, Ethiopia
Bitchfield, Lincolnshire, GBR
Cerro de Pasco, Peru
Dike, Grundy County, IA, USA
El Khroub, Algeria
Fucking Austria
Gun Barrel City, Texas, USA
Ho Chi Minh, Vietnam
Immingham, England, UK