Did you know that O'Reilly is one of the most popular Irish names?
The surnames Reilly and O'Reilly are very popular in Ireland, being among the first dozen in the list. The name derives from the Irish O'Raghailligh, possibly meaning 'sociable tribe', a descendant of Raghallach, the grandson of Conchobhar, king of Connacht in the 10th century, and founder of the clan O'Connor.
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