Within the UK and Ireland, the surname Duff most frequently occurs in Scotland where it is carried by 1 in every 1,488 people. The majority of those with the family name of Duff are to be found living in/around Fife (approx. 3% of all UK Duff's), City of Edinburgh and Glasgow City. The name can also be found in Ireland with 1 in 1,800 people using it, and England with 1 in 9,901.
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