Surname profile
O'Brien
The surname O’Brien is an Irish patronymic meaning “descendant of Brian.” It originated from the Gaelic Ó Briain, linked to the powerful medieval dynasty of Thomond and King…
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Oliveira
Oliveira is a Portuguese surname meaning "olive tree", derived from the Latin word for olive tree. It is a toponymic surname that appeared in medieval Iberia in the…
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O’Connor
The surname O’Connor is of Irish origin, derived from the Gaelic patronymic Ó Conchobhair meaning “descendant of Conchobhar” (lover of hounds). It traces back to the 10th century…
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O’Neill
The surname O’Neill is an Irish patronymic meaning "descendant of Niall," derived from the Gaelic Ó Néill. It is among the most common Irish surnames.
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O’Reilly
The surname O’Reilly is an Irish patronymic meaning ‘descendant of Raghallach’. It originated from the Gaelic Ó Raghallaigh and was borne by the ancient kings of East Bréifne…
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