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There are approximately 4,122 people named Oreilly in the UK. That makes it the 2,519th most common surname overall. Out of every million people in the UK, approximately 65 are named Oreilly.

Region of origin

British Isles

Country of origin

Ireland

Language of origin

Gaelic

Religion of origin

Christian

Classification

Celtic
From name of parent

Related and similar surnames

Aureli
Aurelly
Aurely
Aurelli
Aurevilly
Auriell
Ohreilly
O'Reilly
O'Rielly
O'Railly
O'Relly
O'Reelly
O'Really
O'Reillly
O'Reily
O'Reilley
O'Reiley
O'Riely
O'Rally
O'Rielley
O'Rely

The Oreilly surname in historical dictionaries

Patronymica Britannica (1860)

O'REILLY. The family claim descent "from Brian, the fourth" Milesian king pf Connaught. The name was derived frOm an ancestor called Ragallagh — by softened pronunciation Reilly — who lived at tlie commencement of the eleventh century. His grandson Targaille, prince of East Brefny, was the first who used the name of Ua Ragallagh or O'Reilly." B.L.G.

Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.

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