No MacAlernon households in Griffith's.
| MacAlernon | rare: Armagh, Antrim etc. Ir. Mac Giolla Earnáin (dimin. of first name Earna). A sept of Down. Also MacClernon, q.v. MIF. |
| MacElhannan | Very rare: Belfast, Dublin. Ir. Mac Giolla Chonáin, Conán, little hound. |
| MacElhennon | Very rare: Derry. See Mac Elhannan. |
Parishes where MacAlernon and a second surname are found together
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