Within the UK and Ireland, the surname Sweeney is one of the most popular; frequently occuring in Ireland where it is carried by 1 in every 411 people. The majority of those with the family name of Sweeney are to be found living in/around Leinster (approx. 14% of all UK Sweeney's), Ulster and Connaught. The name can also be found in Scotland with 1 in 1,323 people using it, and England with 1 in 4,201.
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