Fearaile Mac Fhearaile ga  | Fearghal |
Fearaile Mhic Fhearaile ga  | Fearghal |
| Fearaile Nic Fhearaile ga | Fearghal |
| Fearáin Ó Fearáin ga | Fearán |
| Fearáin Uí Fhearáin ga | Fearán |
| Fearáin Ní Fhearáin ga | Fearán |
| Fearchair Mac Fhearchair ga | Fearchar |
| Fearchair Ó Fearchair ga | Fearchar |
| Fearchair Uí Fhearchair ga | Fearchar |
| Fearchair Mhic Fhearchair ga | Fearchar |
| Fearchair Nic Fhearchair ga | Fearchar |
| Fearchair Ní Fhearchair ga | Fearchar |
| Fearghail Ó Fearghail ga | Fearghal |
| Fearghail Uí Fhearghail ga | Fearghal |
| Fearghail Ní Fhearghail ga | Fearghal |
| Fearghaile Mac Fhearghaile ga | Fearghal |
| Fearghaile Mhic Fhearghaile ga | Fearghal |
| Fearghaile Nic Fhearghaile ga | Fearghal |
| Fearghuis Ó Fearghuis ga | Fearghus |
| Fearghuis Uí Fhearghuis ga | Fearghus |
| Fearghuis Ní Fhearghuis ga | Fearghus |
| Fearon en | Fearán |
| Fee en | Fiach |
| Feehan en | Fiachán |
| Feely en | Ficheallach |
| Feeney en | Fiannaí |
| Feeters McFeeters en | Peadar |
| Fegan en | Fiachán |
| Fegan en | Faogán |
| Fehilly en | Ficheallach |
| Féich Ó Féich ga | Fae |
| Féich Uí Fhéich ga | Fae |
| Féich Ní Fhéich ga | Fae |
| Féichín Ó Féichín ga | Fiachán |
| Féichín Uí Fhéichín ga | Fiachán |
| Féichín Ní Fhéichín ga | Fiachán |
| Feighery en | Fiachra |
| Feirtéir ga | Feirtéir |
| Feirtéir ga | Feirtéir |
| Fenlon en | Fionnallán |
| Fennell en | Fionnghal |
| Fennelly en | Fionnghalach |
| Fennessy en | Fionnghus |
| Fenton en | Fiannacht |
| Feorais Mac Fheorais ga | Feoras |
| Feorais Mhic Fheorais ga | Feoras |
| Feorais Nic Fheorais ga | Feoras |
| Ferris en | Fearghus |
| Ferriter en | Feirtéir |
| Ferry en | Fearadhach |