Within the UK and Ireland, the surname Mcwilliam most frequently occurs in Scotland where it is carried by 1 in 15,000 people. The majority of those with the family name of Mcwilliam are to be found living in/around Aberdeen City (approx. 7% of all UK Mcwilliam's), South Ayrshire and East Dunbartonshire. The name can also be found in England with just 1 in every 126,366 people using it, and Ireland with 1 in 201,250.
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