| Antrim: | 3 | Armagh: | 3 | Belfast city: | 1 | Cork: | 3 |
| Derry: | 2 | Donegal: | 6 | Down: | 55 | Dublin: | 2 |
| Dublin city: | 1 | Laois: | 1 | Limerick: | 6 | Louth: | 1 |
| Meath: | 4 | Tyrone: | 4 | Westmeath: | 2 |
| Kee | fairly numerous: W Ulster. Ir. Mac Aoidh, from first name Aodh (fire). One of many synonyms. See Mac Kee. MIF. |
| Keyes | numerous: South East, Limerick, Ulster. Ir. Mac Aoidh (SGA). Woulfe gives Mac an Chaoich, caoch, blind and a Cavan name. The name exists in England with diverse origins. DBS. |
| Keys | numerous: Ulster, particularly Derry-Donegal, Galway etc. Ir. Mac Aoidh. Also as MacKee, q.v. |
| Mac Aoidh | rare: scattered. Ir. Lang. See Mac Coy. |
| MacAodha | rare: scattered. Ir. Lang. See Hayes & Hughes. |
| MacKay | Very numerous: Ulster, especially Antrim; Dublin etc. Ir. Mac Aodha, from first name Aodh, "fire". Mainly a Scottish name. IF. |
| MacKee | Very numerous: Ulster generally, especially Down. Ir. Mac Aoidh, from first name Aodh meaning "fire". Various synonyms: Mac Kay, Mac Coy, Mac Hugh. |
| Mackey | numerous: all areas, especially Ulster, South East, Tipperary-Limerick. Ir. Ó Macdha (manly), a sept of Tipperary. In Ulster, it usually stands for Mac Aoidh, i.e. Mac Kee and Mac Kay, q.v. MIF. |
| Mackie | Quite numerous: Down-Armagh etc. Ir. Mac Aoidh. See Mac Kee. |
Parishes where McKey and a second surname are found together
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