Within the UK and Ireland, the surname Mclennan most frequently occurs in Scotland where it is carried by 1 in 17,516 people. The majority of those with the family name of Mclennan are to be found living in/around City of Edinburgh (approx. 5% of all UK Mclennan's), East Renfrewshire and Aberdeen City. The name can also be found in England with just 1 in every 126,652 people using it, and Ireland with 1 in 161,000.
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