Commune/Paroisse : St Yon [Essonne] 
| Patronymes | Périodes | Actes | |
|---|---|---|---|
| 1. | TARY | 1880 | 1 |
| 2. | TELLIER | 1816-1833 | 2 |
| 3. | TEXIER | 1773 | 1 |
| 4. | THIBOU | 1761 | 2 |
| 5. | THIBOUST | 1766 | 1 |
| 6. | THIBOUT | 1799 | 1 |
| 7. | THIERRY | 1773-1896 | 12 |
| 8. | THOMAS | 1772 | 1 |
| 9. | THORIDENET? | 1822 | 1 |
| 10. | TROUILLON | 1753 | 1 |
| 11. | TROUVE | 1775-1807 | 4 |
| 12. | TRUFFY | 1850 | 1 |
| 13. | TURCOT | 1784 | 1 |
| 14. | TURQUIS | 1841-1889 | 2 |
