| Belfast city: | 3 | Carlow: | 1 | Cavan: | 1 | Cork city: | 2 |
| Down: | 1 | Dublin: | 4 | Dublin city: | 4 | Galway: | 5 |
| Kildare: | 6 | Leitrim: | 4 | Limerick: | 8 | Longford: | 13 |
| Mayo: | 6 | Offaly: | 3 | Roscommon: | 10 | Sligo: | 1 |
| Tyrone: | 1 | Waterford: | 1 | Wexford: | 6 |
| Farrell | Very numerous: all areas but least in Cork. Ir. Ó Fearghail (man of valour). Mediaeval septs were in Longford, Tyrone, Wicklow. Also appears as O'Farrell, O'Ferrall, Frahill. |
| Ferrall | Very rare: Longford. See Farrell. |
| Ó Fearghail | rare: Dublin etc. See Farrell & Farrelly. |
| Ó Fearghail | O'Farrell, Farrell: líonmhar ar fud na tíre, sa Lár ach go h-áirithe. Bhí an chlann ba thábhachtaí i Longfort agus bhíodar chun tosaigh i saol na h-Éireann riamh is choíche. Bhí dhá bhrainse díobh: Buí & Bán. Clanna eile i gCill Mhantáin & Tír Eoghain. An bhrí: fear + gal (fuinneamh). Dob'í Anghaile (Longfort) a gcríoch faoi leith. IF. |
| O'Farrell | numerous: all areas, especially Midlands and Munster. Ir. Ó Fearghaill (man of valour). A major sept of Longford. See also Farrell. IF. |
| O'Ferrall | Very rare: Dublin. Ir. Ó Fearghail. See O'Farrell and Farrell. |
Parishes where O'Farrell and a second surname are found together
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