| Manahan | Quite numerous: Cork-Waterford-Limerick. Ir. Ó Mainchín, dimin. of manach, a monk. A sept of W Cork. See Mannix. |
| Monaghan | Very numerous: Leath Chuinn (Northern Half). Ir. Ó Monacháin. Dimin. of manach, a monk. A sept of Roscommon with probably another in Oriel (Armagh, Monaghan etc) but no connection with the county, which is Muineachán. |
| Monahan | numerous: all areas, especially Cavan-Monaghan-Louth, Midlands, Galway, Donegal. Ir. Ó Monacháin, as Monaghan. |
| Ó Manacháin | Monaghan: an-líonmhar: Leath Chuinn: Cabhán-Muineachán-Lú go sonrach. Bhí clann amháin lonnaithe i Ros Comáin, cois Sionainne. Is cosúil go raibh ceann eile in Oirghialla. Ón ainm Manchán, díspeagadh ar "manach". |
Parishes where Monihan and a second surname are found together
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