No Mac Eachain households in Griffith's.
| 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. |
| Mac Eacháin | Mac Cahon: líon beag: Aontroim thuaidh & rl. Ar aon dul le Mac Eocháin sa deisceart. SGG. |
| MacCahon | Quite numerous: Derry-N Antrim etc. Ir. Mac Eacháin. See Mac Caughan. |
| MacCaughan | fairly numerous: Antrim etc. Ir. Mac Eacháin, dimin. of Eachaidh, horseman. See also Mac Cahon. |
| MacGahan | numerous: Monaghan-Armagh-Tyrone etc. Ir. Mag Eacháin from first name Eachán, dimin. of Eochaidh. The name was associated with Oriel. SI. |
| MacGaughan | Very rare: Belfast etc. Ir. Mag Eacháin. See Mac Gahan. |
Parishes where Mac Eachain and a second surname are found together
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