Within the UK and Ireland, the surname Mcfadyen most frequently occurs in Scotland where it is carried by 1 in 12,230 people. The majority of those with the family name of Mcfadyen are to be found living in/around Glasgow City (approx. 9% of all UK Mcfadyen's), East Dunbartonshire and City of Edinburgh. The name can also be found in England with just 1 in every 148,095 people using it, and Ireland with 1 in 322,000.
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