Within the UK and Ireland, the surname Thomas is one of the most popular; frequently occuring in Wales where it is carried by 1 in every 44 people. The majority of those with the family name of Thomas are to be found living in/around Carmarthenshire (approx. 4% of all UK Thomas's), City and County of Swansea and Rhondda Cynon Taf County Borough. The name is also one of the most popular in England with 1 in 403 people using it.
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