Within the UK and Ireland, the surname Reilly is one of the most popular; frequently occuring in Ireland where it is carried by 1 in every 319 people. The majority of those with the family name of Reilly are to be found living in/around Leinster, Ulster and, to a lesser extent, Connaught. The name can also be found in Scotland with 1 in 831 people using it, and England with 1 in 4,428.
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