Variant spellings are included, so there may be some duplication. If you know of something that should be included, please let me know
| Fada (archived) |
| Fada Kilkenny/Nova Scotia |
| Fada |
| Fadan |
| Fadden |
| Faddian |
| Fadeen |
| Faden |
| Fadian |
| Fadin |
| Fagan Westmeath |
| Fágán Westmeath |
| Fagen Westmeath |
| Fahey (archived) |
| Fahey |
| Fahey |
| Fahy (archived) |
| Fahy |
| Fahy |
| Fainlay (archived) |
| Fainley (archived) |
| Fall |
| Fallan Roscommon |
| Fallen Roscommon |
| Fallis |
| Fallon Roscommon |
| Fallone Roscommon |
| Falls |
| Fanagan Franklin Co., NY |
| Farell |
| Farell (archived) |
| Farell Wexford |
| Farlane |
| Farrasey |
| Farrassy |
| Farrasy |
| Farrel |
| Farrel (archived) |
| Farrel Wexford |
| Farrell |
| Farrell (archived) |
| Farrell Wexford |
| Farrissy |
| Faughnan |
| Faul |
| Faulds |
| Fauls |
| Fawl |
| Fawle |
| Fawls |
| Fergus |
| Fergus |
| Fergus |
| Ferguson |
| Ferguson (archived) |
| Ferrall |
| Ferrall (archived) |
| Ferrall Wexford |
| Ferrel |
| Ferrel (archived) |
| Ferrel Wexford |
| Ferrell |
| Ferrell (archived) |
| Ferrell Wexford |
| Finan |
| Finane |
| Findlay (archived) |
| Findley (archived) |
| Finegan Franklin Co., NY |
| Finigan Franklin Co., NY |
| Finlay (archived) |
| Finley (archived) |
| Finn |
| Finnagan Franklin Co., NY |
| Finnaly (archived) |
| Finnegan Franklin Co., NY |
| Finnigan Franklin Co., NY |
| Finnucan [Tarbert] Co. Kerry |
| Finnucane [Tarbert] Co. Kerry |
| Finucan [Tarbert] Co. Kerry |
| Finucane [Tarbert] Co. Kerry |
| Flanery |
| Flannerry |
| Flannery |
| Fleming Tyrone/Australia |
| Flemming Tyrone/Australia |
| Flin (archived) |
| Fling (archived) |
| Flinn (archived) |
| Flyn (archived) |
| Flyng (archived) |
| Flynn (archived) |
| Flynne (archived) |
| Foaly Breanamore, Castlerea, Co. Roscommon |
| Folan Tuam (archived) |
| Foley Breanamore, Castlerea, Co. Roscommon |
| Follen Tuam (archived) |
| Follin Tuam (archived) |
| Forton (archived) |
| Fortune (archived) |
| Fottrell |
| Fox |
| Fox Cavan |
| Fox (archived) |
| Fox Ireland, New York (archived) |
| Fry Antrim (archived) |
| Furey |
| Furie |
| Furlong (archived) |
| Furlong |
| Fury |
| Fynan |
| Fynn |