Within the UK and Ireland, the surname Colwill most frequently occurs in Wales where it is carried by 1 in 17,439 people. The majority of those with the family name of Colwill are to be found living in/around City and County of Swansea (approx. 3% of all UK Colwill's), Rhondda Cynon Taf County Borough and Neath Port Talbot County Borough. The name can also be found in England with 1 in 48,891 people using it.
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