Within the UK and Ireland, the surname Hennessey most frequently occurs in Ireland where it is carried by 1 in 13,567 people. The majority of those with the family name of Hennessey are to be found living in/around Leinster (approx. 8% of all UK Hennessey's), Munster and Ulster. The name can also be found in England with 1 in 24,161 people using it.
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