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| Garnham | rare: Belfast, Derry. English. A variant of Gernon - see Garland. |
| Gearnún | Gernon: cuíosach annamh: Lú. Leas-ainm: guernon (Fraincis) = croiméal. Tháinig Roger de Gernon i bhfochair Strongbow, Risteard de Cléir, i 1170. |
| Gernon | fairly rare: Louth. Ir. Gearnún. (O Fr. gernon, moustache). The earlier form of Garland, q.v. |
Parishes where a McGernan and a second surname married each other.