| Casey | Very numerous: all provinces, particularly Munster. Ir. Ó Cathasaigh, generally, and Mac Cathasaigh in parts of Ulster. MacLysaght mentions six different septs of the O'Caseys as well as MacCasey in Oriel. Cathaiseach means "watchful". IF. |
| Mac Cathasaigh | Casey: i gCúige Uladh, bhí siad suite in Oirghialla. Ní féidir idirdhealú ar Ó Cathasaigh, q.v. |
| Ó Cathasaigh | rare: Munster etc. Ir.Lang. See Casey. |
| Ó Cathasaigh | Casey: an-líonmhar tríd an dtír: Tá sé chlann faoi leith luaithe ag de Bhulbh. Bhí cinn i Luimeach & Corcaigh mar a bhfuil an-chuid díobh anois ach bhí clanna i Maigh Eo, Ros Comáin & Fear Manach chomh maith. Brí: cathasach =airdeallach. IF & SGG. |
| O'Casey | rare: Dublin etc. Ir. Ó Cathasaigh. See Casey. |
Parishes where Casy and a second surname are found together
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