O'Reilly Surname

The O'Reilly family name is derived from the Gaelic "O'Raghailligh," which means descendants of Raghaillach. The O'Reillys were the most powerful sept of the old Gaelic Kingdom of Breffny, and the family is still very numerous in the area which made up this kingdom, i.e., Cavan and the surrounding counties. The name is frequently shortened to Reilly or Riley. Members of the … [Read more...] about Roots: The O’Reillys