Commune/Paroisse : Montagny-les-Lanches [Haute-Savoie] 
| Patronymes | Périodes | Actes | |
|---|---|---|---|
| 1. | COCHET | 1890 | 1 |
| 2. | COGNET | 1846 | 1 |
| 3. | COHENDET | 1644-1725 | 7 |
| 4. | COLLOMBAT | 1785 | 1 |
| 5. | COMTE | 1857-1860 | 2 |
| 6. | CONSTANTIN | 1680 | 1 |
| 7. | CONTE | 1651-1759 | 2 |
| 8. | CONVERS | 1670 | 1 |
| 9. | CORDELIAT | 1764 | 1 |
| 10. | COSTER | 1741-1928 | 41 |
| 11. | COSTERG | 1704-1836 | 14 |
| 12. | COURT | 1671 | 1 |
| 13. | COURTARDON | 1843 | 1 |
| 14. | COUTIN | 1817-1899 | 2 |
| 15. | COUTURIER | 1872 | 1 |