Within the UK and Ireland, the surname Gilfillan most frequently occurs in Scotland where it is carried by 1 in 5,485 people. The majority of those with the family name of Gilfillan are to be found living in/around Fife (approx. 9% of all UK Gilfillan's), Glasgow City and North Lanarkshire. The name can also be found in Ireland with 1 in 56,163 people using it, and England with 1 in 94,084.
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