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 | ||
| Oldridge | Irish | The son of Alderich. A local atymolog... | ||
| Olds | Irish | Nickname: The old. Also 'the son of O... | ||
| Oldys | Irish | The son of Aldus. | ||
| Oleahy | Irish | |||
| Oleamy | Irish | |||
| Oleary | Irish | The descendant of Lary; 'Llary,' Wels... | ||
| O'leary | Irish | Calf-herd. | ||
| Olee | Irish | |||
| Olenaghan | Irish | |||
| Olennon | Irish | |||
| Oliddane | Irish | |||
| Oliddy | Irish | |||
| Olifant | Irish | An elephant. | ||
| Oliff | Irish | The son of Olive. | ||
| Olivant | Irish | Nickname: The elephant, no doubt a co... | ||
| Olive | Irish | The son of Olive. | ||
| Oliver | Irish | The son of Oliver. The paladin of Cha... | ||
| Olivet | Irish | The son of Olive. diminutive Oliv-et.... | ||
| Ollason | Irish | |||
| Ollerenshaw | Irish | Local: At the alder-shaw, more correc... | ||
| Ollernshaw | Irish | Local: At the alder-shaw, more correc... | ||
| Ollett | Irish | |||
| Olley | Irish | Local: De Oilli, or Oyly. or Oilgi. R... | ||
| Ollier | Irish | The oiler, i.e. an oiolman. Far more ... | ||
| Olliff | Irish | The son of Olive. | ||
| Olliffe | Irish | The son of Olive. |
| Name | Origin | Meaning | ||
| Olligan | Irish | |||
| Ollivant | Irish | Nickname: The elephant, no doubt a co... | ||
| Ollive | Irish | The son of Olive. | ||
| Olliver | Irish | The son of Oliver. The paladin of Cha... | ||
| Ollver | Irish | |||
| Olney | Irish | Local: Of Olney, a parish in diocese ... | ||
| Oloane | Irish | |||
| Ologue | Irish | |||
| Olonergan | Irish | |||
| Olooney | Irish | |||
| Olorcan | Irish | |||
| Olorenshaw | Irish | Local: At the alder-shaw, more correc... | ||
| Oloughlin | Irish | |||
| Oloughran | Irish | |||
| Oluby | Irish | |||
| Olunney | Irish | |||
| Olver | Irish | The son of Oliver. The paladin of Cha... | ||
| Olyett | Irish | The son of Olive. diminutive Oliv-et.... | ||
| Olynam | Irish | |||
| Olyphant | Irish | Nickname: The elephant, no doubt a co... | ||
| Omacken | Irish | |||
| Omackey | Irish | |||
| Omahoney | Irish | |||
| Omahony | Irish | Bear-calf. |
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