Within the UK and Ireland, the surname Mullen most frequently occurs in Ireland where it is carried by 1 in every 941 people. The majority of those with the family name of Mullen are to be found living in/around Leinster (approx. 17% of all UK Mullen's), Ulster and Connaught. The name can also be found in Scotland with 1 in 1,506 people using it, and England with 1 in 7,440.
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