Commune/Paroisse : Thusy [Haute-Savoie] 
| Patronymes | Périodes | Actes | |
|---|---|---|---|
| 1. | COCHET | 1739-1892 | 2 |
| 2. | COGNIER | 1868 | 1 |
| 3. | COHENDET | 1711 | 1 |
| 4. | COISSARD | 1626-1899 | 46 |
| 5. | COLLET | 1754-1886 | 2 |
| 6. | COLLOMB | 1890 | 1 |
| 7. | COLLONGE | 1859 | 1 |
| 8. | COLOMBIN | 1871 | 1 |
| 9. | COMBAY | 1811 | 1 |
| 10. | COMBESPINE | 1798 | 1 |
| 11. | COMBRICHON | 1868 | 1 |
| 12. | COMOZ | 1832 | 1 |
| 13. | COMTE | 1800-1903 | 12 |
| 14. | CONCHON | 1879 | 1 |
| 15. | CONVERT | 1829-1892 | 20 |
| 16. | COQUETTI | 1693 | 1 |
| 17. | CORBIER | 1745-1884 | 6 |
| 18. | COSTER | 1873 | 1 |
| 19. | COTTAT | 1828 | 1 |
| 20. | COUDURIER | 1656-1750 | 9 |
| 21. | COUPAT | 1863 | 1 |
| 22. | COUSITARD | 1823 | 1 |
| 23. | COUTURIER | 1870 | 1 |