Principal Original Families of County Clare
| FAMILY NAMES | BARONY OR TERRITORY |
| O Brien | Tulla, Islands, Inchiquin |
| McNamara | Bunratty |
| MacMahon | Clonderlaw, Moyarta |
| Mac Clancy/Clancy | Inchiquin |
| O Hehir | Ibrickan |
| O Hyne | Ibrickan |
| O Deas | Inchiquin |
| O Griffy | Tulla |
| O Quin | Inchiquin |
| Daly | Burren |
| O Grady | Bunratty |
| Mac Gorman/O Gorma | Ibrickan |
| Mac Curtin/Curtin | Inchiquin |
| O Connor | Corcomroe |
| O Davoren | Burren |
| Cahane/Keane | Ibrickan |
| Mac Brady/Brady | Inchiquin |
| Moloney | Tulla |
| O Loghlen/Loughlen | Burren |
Hereunder are 101 family names and their number as recorded in Church records at the turn of the century (1900) for the 46 Clare parishes and St. Mary's Limerick City parish.
| FAMILY NAME | NUMBER OF FAMILIES |
| 1. McMahon | 2565 |
| 2. McNamara | 2535 |
| 3. O'Brien | 1730 |
| 4. Moloney | 1680 |
| 5. Ryan | 1500 |
| 6. Kelly | 1270 |
| 7. McInerney | 1250 |
| 8. O'Connor | 1170 |
| 9. Keane | 1150 |
| 10. O'Halloran | 930 |
| 11. Hogan | 920 |
| 12. Burke | 915 |
| 13. Murphy | 860 |
| 14. Lynch | 840 |
| 15. Walsh | 760 |
| 16. McCarthy | 720 |
| 17. O'Loughlin | 710 |
| 18. O'Neill | 690 |
| 19. O'Donohue | 650 |
| 20. Hayes | 640 |
| 21. Hehir | 640 |
| 22. O'Dea | 630 |
| 23. Griffy-Griffin | 630 |
| 24. Collins | 610 |
| 25. Callinan-Cullinan | 610 |
| 26. O'Connell | 610 |
| 27. McGrath | 580 |
| 28. O'Sullivan | 575 |
| 29. Fitzgerald | 570 |
| 30. Hickey | 550 |
| 31. Moroney | 540 |
| 32. Clancy | 515 |
| 33. Considine | 490 |
| 34. Quinn | 485 |
| 35. O'Gorman | 470 |
| 36. Reidy | 465 |
| 37. Flannagan | 460 |
| 38. Daly | 450 |
| 39. Neylon | 440 |
| 40. Kennedy | 430 |
| 41. Egan | 430 |
| 42. Mullina-Moylan | 410 |
| 43. Shannon-Shanahan | 410 |
| 44. Casey | 405 |
| 45. Carmody | 400 |
| 46. Corry-Curry | 400 |
| 47. Healy | 400 |
| 48. Burns-Byrnes | 380 |
| 49. Downes | 380 |
| 50. Sexton | 380 |
| 51. Browne | 375 |
| 52. Tuohy | 375 |
| 53. Malone | 370 |
| 54. O'Grady | 370 |
| 55. Fitzpatrick | 360 |
| 56. McDonnell | 360 |
| 57. Crowe | 355 |
| 58. Frawley | 350 |
| 59. Mahony | 350 |
| 60. Scanlan | 350 |
| 61. Donnellan | 340 |
| 62. Barry | 330 |
| 63. Conway | 330 |
| 64. Gleeson | 330 |
| 65. Corbet | 325 |
| 66. Madigan | 320 |
| 67. O'Dwyer | 320 |
| 68. O'Shea | 320 |
| 69. Greene | 310 |
| 70. Hanrahan | 310 |
| 71. Meany | 310 |
| 72. White | 310 |
| 73. Boland | 300 |
| 74. Carroll | 300 |
| 75. Cleary | 300 |
| 76. Clune | 300 |
| 77. Costelloe | 300 |
| 78. Curtin | 300 |
| 79. Cusack | 300 |
| 80. Meehan | 300 |
| 81. Murry-Murrihy | 300 |
| 82. O'Donnell | 300 |
| 83. O'Keefe | 300 |
| 84. Sheehan | 300 |
| 85. Flynn | 290 |
| 86. Linnane-Linneen | 290 |
| 87. Purtill-Purcell | 290 |
| 88. O'Shaughnessy | 280 |
| 89. Gallagher | 270 |
| 90. Houlihan | 270 |
| 91. Noonan | 270 |
| 92. Slattery | 270 |
| 93. Whelan | 270 |
| 94. Cunningham | 260 |
| 95. Doherty | 260 |
| 96. Glinn-Glynn | 260 |
| 97. Howard | 260 |
| 98. Kinnane-Ginnane | 260 |
| 99. Cahill | 255 |
| 100. Cooney | 255 |
| 101. Hassett | 255 |
Clare County Library wishes to thank Clare
Local Studies Project for preparation of text for this publication.