Achternamen
| Achternaam | Aantal |
|---|---|
| Ortgiess | 1 |
| Orth | 3 |
| Orthmanns | 1 |
| Orths | 1 |
| Ortjens | 1 |
| Ortmanns | 5 |
| Ortmans | 48 |
| Ortner | 1 |
| Ortsen | 1 |
| Orval | 5 |
| Ory | 6 |
| Orye | 2 |
| Orzechowski | 1 |
| Os | 1 |
| Os, van | 48 |
| Os-Frorath, van | 1 |
| Os-Keuls, van | 1 |
| Osch | 1 |
| Osch, van | 37 |
| Oscheija | 1 |
| Oschhe | 1 |
| Osendarp | 2 |
| Osenga | 1 |
| Osiadacz | 1 |
| Osinga | 2 |