Within the UK and Ireland, the surname Mcsweeney most frequently occurs in Ireland where it is carried by 1 in every 1,521 people. The majority of those with the family name of Mcsweeney are to be found living in/around Munster, Leinster and, to a lesser extent, Connaught. The name can also be found in England with just 1 in every 115,423 people using it.
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