Within the UK and Ireland, the surname Cusack most frequently occurs in Ireland where it is carried by 1 in every 1,696 people. The majority of those with the family name of Cusack are to be found living in/around Leinster (approx. 22% of all UK Cusack's), Munster and Ulster. The name can also be found in England with 1 in 30,607 people using it.
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