Irish last names starting with O |
Irish last names in alphabetical order: A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
| Name | Origin | Meaning | ||
| Ogrowney | Irish | |||
| Ogston | Irish | |||
| Ogstone | Irish | |||
| Oguiney | Irish | |||
| Ogunning | Irish | |||
| Ohae | Irish | |||
| Ohagan | Irish | |||
| Ohahessy | Irish | |||
| Ohallagan | Irish | |||
| Ohallahan | Irish | |||
| Ohalley | Irish | |||
| Ohalligan | Irish | |||
| Ohallinan | Irish | |||
| Ohalloran | Irish | |||
| Ohalpin | Irish | |||
| Ohamill | Irish | |||
| Ohamsey | Irish | |||
| Ohanlon | Irish | |||
| Ohanly | Irish | |||
| Ohannigan | Irish | |||
| Ohannon | Irish | |||
| Ohanraghty | Irish | |||
| Ohanrahan | Irish | |||
| Ohara | Irish | The descendant of "Hara," Chaldee for... | ||
| Oharkin | Irish | |||
| Oharney | Irish |
| Name | Origin | Meaning | ||
| Ohart | Irish | |||
| Ohartnett | Irish | |||
| Oharty | Irish | |||
| Ohassan | Irish | |||
| Ohassett | Irish | |||
| Ohaughey | Irish | |||
| Ohaughian | Irish | |||
| Oheadon | Irish | |||
| Oheany | Irish | |||
| Ohearty | Irish | |||
| Ohederman | Irish | |||
| Oheelan | Irish | |||
| Oheffron | Irish | |||
| Ohegarty | Irish | |||
| Ohehir | Irish | |||
| Ohenaghan | Irish | |||
| Ohennessy | Irish | |||
| Ohenry | Irish | |||
| Oheslin | Irish | |||
| Oheyne | Irish | |||
| Ohingerty | Irish | |||
| Ohoban | Irish | |||
| Ohollegan | Irish | |||
| Oholleran | Irish |
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