Within the UK and Ireland, the surname Gwilliam most frequently occurs in Wales where it is carried by 1 in 7,656 people. The majority of those with the family name of Gwilliam are to be found living in/around City and County of Swansea (approx. 3% of all UK Gwilliam's), Vale of Glamorgan County Borough and Pembrokeshire. The name can also be found in England with 1 in 27,004 people using it.
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