| Fennessy | fairly numerous: Munster etc. Ir. Ó Fionnghusa (fair vigour). Associated with Waterford. Mod. Ó Fionnasa. [Later, more extensive research on the name indicates that the Irish original was in fact Ó Fiannghusa, from Fiann (soldier) and gus (strong)]. |
| Ó Fionnghusa | Fennessy: cuíosach líonmhar: Cúige Mumhan, Port Lairge ach go h-áirithe. An bhrí: fionn + gus (fuinneamh). |
Parishes where Fennesy and a second surname are found together
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