Frantik.name
| N A M E | O R I G I N | M E A N I N G |
| Fitz-gibbon | English | Son of Gilbert. |
| Fitz-gilbert | English | Son of Gilbert. |
| Fitz-hugh | English | Son of Hugh. |
| Fitz-james | English | Son of James. |
| Fitz-patrick | English | Son of Patrick. |
| Fitz-simon | English | Son of Simon. |
| Fitz-walter | English | Son of Walter. |
| Fitz-water | English | Son of Walter. |
| Fitzadam | English | Son of Adam. |
| Fitzgerald | English | Mighty spearholder's son. |
| Fitzgibbon | English | Son of Gilbert. |
| Fitzgilbert | English | Son of Gilbert. |
| Fitzhugh | English | Son of Hugh. |
| Fitzjames | English | Son of James. |
| Fitzpatrick | English | Son of Patrick. Surname. |
| Fitzroy | English | A name meaning 'king's illegitimate son'. |
| Fitzsimmons | English | Son of Simon. |
| Fitzsimon | English | Son of Simon. |
| Fitzsimons | English | Son of Simon. |
| Fitzwalter | English | Son of Walter. |
| Fitzwater | English | Son of Walter. |
| Fitzwilliam | Celtic/Gaelic | Son of William |
| Fjall | Norse | From the rough hill. |
| Flaine | Irish | Variant of Flannery: Red-haired. |
| Flainn | Irish | Ruddy. |
| Flaminio | Spanish | Priest. |
| Flanagan | Irish | Ruddy. |
| Flann | Celtic/Gaelic | Son of the red-haired man |
| Flannagain | Irish | Ruddy. |
| Flannagan | Irish | Surname. |
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