Commune/Paroisse : Wavre
| Patronymes | Périodes | Actes | |
|---|---|---|---|
| 1. | OBERT | 1848 | 1 |
| 2. | ODIGE | 1814-1896 | 9 |
| 3. | OGEZ | 1892 | 1 |
| 4. | OLEFFE | 1876 | 1 |
| 5. | OLISLAEGERS | 1860 | 1 |
| 6. | OLISLAGERS | 1802 | 1 |
| 7. | OLIVIER | 1834 | 1 |
| 8. | OLTEN | 1845 | 1 |
| 9. | ONY | 1843 | 1 |
| 10. | ORBECQ | 1897 | 1 |
| 11. | ORBEEK | 1890 | 2 |
| 12. | ORTMANS | 1899 | 1 |
| 13. | ORTS | 1881 | 1 |
| 14. | ORVAL | 1823-1889 | 13 |
| 15. | OTTA | 1804 | 1 |
| 16. | OTTHIERS | 1862 | 1 |