Commune/Paroisse : St Yon [Essonne] 
| Patronymes | Périodes | Actes | |
|---|---|---|---|
| 1. | ABRAN | 1858 | 1 |
| 2. | AGEORGES | 1900 | 1 |
| 3. | ALBANEL | 1857 | 1 |
| 4. | ALEON | 1852 | 1 |
| 5. | ALLEGOT | 1850 | 1 |
| 6. | ALLETON | 1836-1895 | 8 |
| 7. | ALLOIN? | 1820 | 1 |
| 8. | ANAIS | 1821-1884 | 4 |
| 9. | ANOUBZ | 1776 | 1 |
| 10. | APTLER? | 1865 | 1 |
| 11. | ARSON | 1819 | 1 |
| 12. | AUBERT | 1834-1861 | 2 |
| 13. | AUBRY | 1892 | 1 |
| 14. | AUJEUSSIENS? | 1793 | 1 |
