Within the UK and Ireland, the surname Oneill most frequently occurs in Ireland where it is carried by 1 in every 1,629 people. The majority of those with the family name of Oneill are to be found living in/around Leinster (approx. 26% of all UK Oneill's), Ulster and Munster. The name can also be found in England with 1 in 33,164 people using it.
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