Individuals
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 | ? | … | None
| Surname | Individuals |
|---|---|
| O'Brien | 12 |
| O'Brien Kelly | 1 |
| O'Callaghan | 1 |
| O'Connell | 1 |
| O'Connor | 4 |
| O'Doherty | 1 |
| O'Donnell | 5 |
| O'Donovan | 3 |
| O'Driscoll | 1 |
| O'Dwyer | 1 |
| O'Halloran | 3 |
| O'Keefe | 3 |
| O'Keiffe | 1 |
| O'Leary | 5 |
| O'Malley | 10 |
| O'Neill | 7 |
| O'Sullivan | 234 |