Achternamen
| Achternaam | Aantal |
|---|---|
| Oberwaul | 1 |
| Oberye | 1 |
| Oboth | 1 |
| Obrié | 4 |
| Obst | 1 |
| Obstals | 2 |
| Obstetar | 1 |
| Obsteter | 1 |
| Och, van | 3 |
| Ochal | 1 |
| Ochocki | 1 |
| Ochsner | 1 |
| Ochten, van | 3 |
| Ockeloen | 1 |
| Ocken, van | 1 |
| Ocvirk | 2 |
| Odekerken | 126 |
| Odendahl | 1 |
| Odenhausen | 2 |
| Odenhoven | 1 |
| Odenhoven, van | 1 |
| Odenkirchen | 3 |
| Odijk, van | 3 |
| Odink | 1 |
| Odor | 1 |