Within the UK and Ireland, the surname Shanahan most frequently occurs in Ireland where it is carried by 1 in every 1,298 people. The majority of those with the family name of Shanahan are to be found living in/around Munster, Leinster and, to a lesser extent, Connaught. The name can also be found in Wales with 1 in 12,310 people using it, and England with 1 in 26,978.
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