Within the UK and Ireland, the surname Gillan most frequently occurs in Scotland where it is carried by 1 in every 3,083 people. The majority of those with the family name of Gillan are to be found living in/around Glasgow City (approx. 8% of all UK Gillan's), Inverclyde and South Lanarkshire. The name can also be found in Ireland with 1 in 7,103 people using it, and England with 1 in 41,283.
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