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From the “Reilly” Wiki:

“It is usually anglicised as ReillyRiley and O’Reilly. The original form of the name, Ó Raghallaigh, denotes “from/of Raghallach”, the name Raghallach thought to be derived from the compounds ragh (meaning “race”) and ceallach (meaning “sociable”).

The Ó Raghallaigh family were part of the Connachta, with the eponymous Raghallach said to have died at the Battle of Clontarf in 1014. The family became the kingsof East Breifne, modern-day County Cavan and County Longford.

The name is common and widespread throughout Ireland, ranked 8th most common in 1890 and 11th in 1996.”

 

 

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