| Gahan | numerous: Wexford etc. Ir. Ó Gaoithín (gaoth, wind). Chiefs of Síol Éalaigh (Shillelagh) in Wicklow. A group with the same name in N Connacht now appear as Guihen and Wynne. MIF & SGG. |
| Gaughan | fairly numerous: Mayo etc. Ir. Ó Gáibheacháin (Gácháin). A sept of Uí Fiachrach (N Connacht). Also as Gavaghan and Gavigan, q.v. MIF & SGG. |
| Geehan | rare: Offaly-Tipperary. Ir. Ó Gaoithín. From gaoth, wind; perhaps a diminutive of Ó Maolghaoithe. A family of Síol Éalaigh, Wicklow, existing as Gahan. Also a Connacht group which appears as Wynne. See Gahan. SGG. |
| MacCahon | Quite numerous: Derry-N Antrim etc. Ir. Mac Eacháin. See Mac Caughan. |
| Ó Gaoithín | (1) Gahan, (2) Guihen: tá (1) líonmhar i Loch Garman; is líon beag (2) i gCiarraí, Ros Comáin & Liatroim. Deineadh Wynn díobh i gConnachta, leis. Bhí an chéad dream i gceannas i Síol Éalaigh, Cill Mhantáin. Fréamh: ón ainm Gaoth - féach Mac Gaoithe. |
Parishes where Gahen and a second surname are found together
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