Commune/Paroisse : Bayonne [Pyrénées Atlantiques] 
| Patronymes | Périodes | Actes | |
|---|---|---|---|
| 1. | YALDY | 1930 | 1 |
| 2. | YALLIVET | 1902 | 1 |
| 3. | YANCY | 1920-1943 | 2 |
| 4. | YAÑEZ | 1848-1849 | 2 |
| 5. | YANGOURDO | 1889 | 1 |
| 6. | YANGUAS | 1943 | 1 |
| 7. | YBANEZ | 1868-1896 | 2 |
| 8. | YBAR | 1871 | 1 |
| 9. | YBARBIA (DE) | 1865 | 1 |
| 10. | YBARBOURE | 1852 | 1 |
| 11. | YBARCQ | 1868 | 1 |
| 12. | YBARGARAY | 1873 | 1 |
| 13. | YBARLUCEA DE | 1842 | 1 |
| 14. | YBARNÉGARAY | 1935 | 1 |
| 15. | YBARRA (DE) | 1842 | 1 |
| 16. | YBARRÉGUI | 1858 | 1 |
| 17. | YBARROLA | 1920-1921 | 2 |
| 18. | YCASETA | 1915-1925 | 2 |
| 19. | YCETA | 1875 | 1 |
| 20. | YDE | 1812 | 1 |
| 21. | YDIART | 1862 | 1 |
| 22. | YEGER | 1813 | 1 |
| 23. | YETANO | 1844-1914 | 6 |
| 24. | YGARTABURU | 1876 | 1 |
| 25. | YGEA | 1859-1891 | 2 |
| 26. | YGNARD | 1947 | 1 |
| 27. | YGNOTZ | 1904 | 1 |
| 28. | YIER | 1917 | 1 |
| 29. | YLLIONNET | 1931 | 1 |
| 30. | YMAR (DE) | 1867 | 1 |
| 31. | YMATS | 1917 | 1 |
| 32. | YMAZ | 1893 | 1 |
| 33. | YMAZ DE | 1874 | 1 |
| 34. | YMAZ (DE) | 1866 | 1 |
| 35. | YNAR | 1813 | 1 |
| 36. | YNDART | 1915 | 1 |
| 37. | YNURRITEGUI | 1887 | 1 |
| 38. | YNZAURDI | 1842 | 1 |
| 39. | YOKIMOGLOUS | 1929 | 1 |
| 40. | YOT | 1870-1918 | 6 |
| 41. | YOULL | 1844 | 1 |
| 42. | YRACHET | 1812 | 1 |
| 43. | YRAZOQUI | 1862-1932 | 3 |
| 44. | YRAZUSTA | 1889 | 1 |
| 45. | YRIART | 1915 | 1 |
| 46. | YRIARTE | 1851-1936 | 10 |
| 47. | YRIBAREN | 1903 | 1 |
| 48. | YRIBARREN | 1852-1933 | 5 |
| 49. | YRIBARREN (DE) | 1904 | 1 |
| 50. | YRIBERRI | 1912-1945 | 2 |
| 51. | YRIGOYEN | 1845 | 1 |
| 52. | YRISARRI | 1913 | 1 |
| 53. | YRISSARRY | 1852-1859 | 2 |
| 54. | YROL | 1882 | 1 |
| 55. | YROUMÉ | 1853-1898 | 12 |
| 56. | YRRIBARREN | 1885 | 1 |
| 57. | YRUMBERRY | 1875 | 1 |
| 58. | YRYGOYEN | 1865 | 1 |
| 59. | YSLA | 1850 | 1 |
| 60. | YSO | 1914 | 1 |
| 61. | YSTUETA | 1873 | 1 |
| 62. | YTHURBIDE | 1850 | 1 |
| 63. | YTHURBISQUI | 1869 | 2 |
| 64. | YTOURI | 1870 | 1 |
| 65. | YTURBIDE | 1845-1921 | 10 |
| 66. | YTURIA | 1850 | 1 |
| 67. | YTURRIAGA | 1851 | 1 |
| 68. | YVAN | 1812-1933 | 3 |
| 69. | YVERNAJAUD | 1871 | 1 |
| 70. | YVES | 1896-1922 | 3 |
| 71. | YVON | 1944 | 1 |
| 72. | YZA | 1900 | 1 |