O'Casey

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O'Casey
Family name
Meaning descendant of Cathasach
(vigilant or watchful)
Region of origin Ireland
Language(s) of origin Old Irish
(Anglicized)
Related names O'Cathasaigh
Casey (disambiguation)
MacCasey

O'Casey is a common variation of the Gaelic cathasaigh, meaning vigilant or watchful, with the added anglicized prefix O' of the Gaelic Ó, meaning grandson or descendant. At least six different septs used this name, primarily in the Counties of Cork and Dublin.

People with the surname O'Casey include:

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