| Antrim: | 1 | Armagh: | 4 | Clare: | 4 | Derry: | 4 |
| Down: | 3 | Dublin: | 2 | Dublin city: | 2 | Fermanagh: | 3 |
| Galway: | 1 | Laois: | 1 | Leitrim: | 1 | Longford: | 6 |
| Louth: | 8 | Mayo: | 4 | Meath: | 4 | Monaghan: | 2 |
| Offaly: | 4 | Roscommon: | 1 | Tipperary: | 1 | Westmeath: | 8 |
| Wexford: | 1 |
| Guinness | fairly rare: Belfast area and scattered. Ir. Mac Aonghuis, from early personal name Aonghus, Óengus. A sept of Down. See MacGuinness, Magennis. IF. |
| Mac Aonghusa | rare: Dublin etc. Ir. Lang. See Mac Guinness. |
| MacEnnis | Very rare: Limerick. See Mac Guinness. |
| MacGennis | Very rare: Dublin. See Magennis. |
| MacGinnis | Derry etc. Ir. Mag Aonghuis. See Mac Guinness. |
| MacGuinness | Very numerous: all areas, especially Ulster, Connacht, N Leinster. Ir. Mag Aonghusa, Mag Aonghuis. From legendary first name Óengus. A leading sept of Ulster, chiefs of Uíbh Eathach (Iveagh) in Down. Perhaps now most celebrated for the dark beer. |
| Magenniss | numerous: Down-Armagh etc. Ir. Mag Aonghusa. Variant of Mac Guinness, q.v. |
| Maginess | fairly rare: Down-Armagh. See Mac Guinness. |
| Maginnes | fairly numerous: Belfast, Down-Antrim etc. Ir. Mag Aonghusa. Variant of Mac Guinness, q.v. |
| Maguinness | rare: Down etc. Variant of Mac Guinness, q.v. |
Parishes where McGuiness and a second surname are found together
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