Within the UK and Ireland, the surname Clay most frequently occurs in Wales where it is carried by 1 in 10,126 people. The majority of those with the family name of Clay are to be found living in/around Rhondda Cynon Taf County Borough (approx. 13% of all UK Clay's), City and County of Cardiff and Blaenau Gwent County Borough. The name can also be found in Ireland with 1 in 66,164 people using it.
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