| Language(s) | Old Irish (Anglicized) |
|---|---|
| Origin | |
| Meaning | Vigilant or watchful |
| Region of origin | Ireland |
| Other names | |
| Variant form(s) | Caissie O'Casey O'Cathasaigh MacCasey O'Casaigh |
Casey is a common variation of the Irish Gaelic Cathasaigh/Cathaiseach, meaning "vigilant" or "watchful". At least six different septs used this name, primarily in the counties of Cork and Dublin.
People with the surname Casey include: