IrishCentral's top ten most popular Irish last names

Read complete clan story and see photos about each family

10. O'Reilly - ?

The O'Reillys round out the top 10 most popular names in Ireland.

Their family name is derived from the Gaelic "O'Raghailligh," meaning descendants of Raghaillach.

The O'Reillys were the most powerful sept of the old Gaelic kingdom of Breffny (Cavan and the surrounding counties), and the family is still prominent in the area.

Reilly, often spelled Riley, has become a trendy given name in the U.S., for both baby boys and girls.

Originally published in 2010.
 

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