Within the UK and Ireland, the surname Llewelyn most frequently occurs in Wales where it is carried by 1 in 5,478 people. The majority of those with the family name of Llewelyn are to be found living in/around Carmarthenshire (approx. 12% of all UK Llewelyn's), City and County of Swansea and City and County of Cardiff. The name can also be found in England with just 1 in every 107,447 people using it.
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