Achternamen
| Achternaam | Aantal |
|---|---|
| O'riordan | 1 |
| Obbeek | 1 |
| Obbels | 1 |
| Obbema | 1 |
| Obbens | 6 |
| Obbing | 2 |
| Obdam | 3 |
| Obdeijn | 1 |
| Obdeyn | 1 |
| Obels | 1 |
| Oben | 2 |
| Oberdorf | 28 |
| Oberdorff | 1 |
| Oberendorff | 1 |
| Obererlacher | 1 |
| Obergen, van | 1 |
| Oberije | 9 |
| Oberjé | 18 |
| Oberlick | 1 |
| Obermaier | 1 |
| Obermeier | 1 |
| Oberndorf | 7 |
| Oberndorff | 23 |
| Obers | 12 |
| Obert | 1 |