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.

O'Casey
Origin
Language(s)Old Irish
(Anglicized)
Meaningdescendant of Cathasach
(vigilant or watchful)
Region of originIreland
Other names
Variant form(s)O'Cathasaigh
Casey (disambiguation)
MacCasey

According to historian C. Thomas Cairney, the O'Caseys were the chiefly family of the Saithne tribe who in turn were from the Dumnonii or Laigin who were the third wave of Celts to settle in Ireland during the first century BC.[1]

People with the surname O'Casey include:

See also

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References

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  1. ^ Cairney, C. Thomas (1989). Clans and Families of Ireland and Scotland. Jefferson, North Carolina, United States, and London: McFarland & Company. pp. 78–81. ISBN 0899503624.
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