Within the UK and Ireland, the surname Drennan most frequently occurs in Ireland where it is carried by 1 in 6,265 people. The majority of those with the family name of Drennan are to be found living in/around Leinster and Munster. The name can also be found in Scotland with 1 in 9,460 people using it, and England with 1 in 61,180.
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