Commune/Paroisse : Sciez [Haute-Savoie] 
| Patronymes | Périodes | Actes | |
|---|---|---|---|
| 1. | COFFY | 1884 | 1 |
| 2. | COINDOZ | 1855 | 1 |
| 3. | COLLET | 1672-1803 | 4 |
| 4. | COLLIARD | 1775-1848 | 2 |
| 5. | COLLOMB | 1725-1833 | 3 |
| 6. | COLLON | 1720-1734 | 2 |
| 7. | COLLY | 1727 | 1 |
| 8. | COLON | 1722 | 1 |
| 9. | COMBAZ | 1753 | 1 |
| 10. | COMBET | 1866 | 1 |
| 11. | COMBETA | 1720 | 1 |
| 12. | COMMUNAU | 1707 | 1 |
| 13. | COMPAGNON | 1793-1898 | 18 |
| 14. | CONDEVAUX | 1694-1897 | 16 |
| 15. | CONDEVEAUX | 1695 | 1 |
| 16. | CONTE | 1762 | 1 |
| 17. | CORAJOUX | 1895 | 1 |
| 18. | CORNIER | 1686 | 1 |
| 19. | CORNINGE | 1713-1815 | 2 |
| 20. | COSET | 1887 | 1 |
| 21. | COTTET | 1757-1894 | 2 |
| 22. | COURAJOUD | 1900 | 1 |
| 23. | COURAJOUX | 1809-1874 | 4 |
| 24. | COURT | 1816 | 1 |
| 25. | COURTAGER | 1759 | 1 |
| 26. | COUTY | 1760-1892 | 12 |