Commune/Paroisse : Onnion [Haute-Savoie] 
| Patronymes | Périodes | Intervenant 1 | Intervenant 2 | |
|---|---|---|---|---|
| 1. | COCHET | 1868-1898 | 1 | 1 |
| 2. | COLLET | 1887 | - | 1 |
| 3. | COMBETTA | 1624-1685 | 4 | 2 |
| 4. | COMBETTA DIT TRAPPA | 1644 | - | 1 |
| 5. | CONVERSY | 1886 | 1 | - |
| 6. | CORBET | 1862 | - | 1 |
| 7. | CORBEY | 1708 | - | 1 |
| 8. | CORNIER | 1857-1865 | 2 | 1 |
| 9. | CORNILLAC | 1845 | 1 | - |
| 10. | CORNILLON | 1867 | 1 | - |
| 11. | COTTON | 1864 | 1 | - |
| 12. | COUDURIER | 1892-1914 | 1 | 1 |