Within the UK and Ireland, the surname Kiernan most frequently occurs in Ireland where it is carried by 1 in every 1,269 people. The majority of those with the family name of Kiernan are to be found living in/around Leinster (approx. 43% of all UK Kiernan's), Ulster and Connaught. The name can also be found in Scotland with 1 in 12,898 people using it, and England with 1 in 22,356.
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