|Farnan||Quite numerous: Belfast, N Midlands. Ir. Ó Farannáin, Forannán was a popular first name in early Ireland. The family were erenaghs at Ardstraw, Tyrone. SGG.|
|Fearnon||Very rare: scattered in Ulster. Ir. Ó Fearnáin, according to Woulfe, an abbreviation of Ó h-Ifearnáin which is however a southern name. Ó Farannáin (Farnan) appears more apt. SI & SGG.|
|Fernane||Very rare: Kerry. Ir. Ó Farannáin. See Farnan.|
|Ó Fearnáin||Fernane: fíor-annamh: Trá Lí. giorriú ar Ó h-Ifearnáin, ceaptar. Leagan eile: Ó h-Earnáin.|
Parishes where Farnan and a second surname are found together
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