Irish O' Last Names: A Comprehensive Guide to Their Meanings

This comprehensive guide explores the fascinating world of Irish O' last names, providing a detailed look into their origins and meanings. These surnames, often prefixed with "O'," are a rich tapestry of Irish history, culture, and tradition. Discover the stories behind these names, tracing their lineage back to the ancient Gaelic language and the powerful clans of Ireland.
1. **O'Brien:** Descendant of Brian, a popular Irish name meaning "strong" or "noble".
2. **O'Connell:** Descendant of Connell, meaning "wolf" or "bright-haired".
3. **O'Connor:** Descendant of Connor, meaning "lover of hounds".
4. **O'Reilly:** Descendant of Reilly, meaning "valiant" or "strong".
5. **O'Neill:** Descendant of Niall, meaning "champion" or "cloud".
6. **O'Donnell:** Descendant of Donnell, meaning "chieftain" or "lord".
7. **O'Sullivan:** Descendant of Sullivan, meaning "black-eyed" or "dark".
8. **O'Moore:** Descendant of Moore, meaning "sea warrior" or "great lord".
9. **O'Callaghan:** Descendant of Callaghan, meaning "handsome" or "fair-haired".
10. **O'Doherty:** Descendant of Doherty, meaning "God is my lord".
11. **O'Carroll:** Descendant of Carroll, meaning "brave" or "strong".
12. **O'Shea:** Descendant of Shea, meaning "God is gracious".
13. **O'Hanrahan:** Descendant of Hanrahan, meaning "nobleman" or "lord".
14. **O'Higgins:** Descendant of Higgins, meaning "son of Hugh".
15. **O'Meara:** Descendant of Meara, meaning "sea warrior".
16. **O'Malley:** Descendant of Malley, meaning "chief" or "leader".
17. **O'Rourke:** Descendant of Rourke, meaning "great king".
18. **O'Brien:** Descendant of Brian, meaning "strong" or "noble".
19. **O'Toole:** Descendant of Toole, meaning "wolf" or "brave".
20. **O'Brady:** Descendant of Brady, meaning "strong" or "valiant".
21. **O'Driscoll:** Descendant of Driscoll, meaning "son of the lord".
22. **O'Flaherty:** Descendant of Flaherty, meaning "fiery" or "bold".
23. **O'Grady:** Descendant of Grady, meaning "noble" or "lord".
24. **O'Halloran:** Descendant of Halloran, meaning "handsome" or "fair".
25. **O'Hehir:** Descendant of Hehir, meaning "warrior" or "champion".
26. **O'Kelly:** Descendant of Kelly, meaning "bright-haired" or "warlike".
27. **O'Loughlin:** Descendant of Loughlin, meaning "little wolf".
28. **O'Mahony:** Descendant of Mahony, meaning "son of the lord".
29. **O'Mara:** Descendant of Mara, meaning "great" or "noble".
30. **O'Nolan:** Descendant of Nolan, meaning "champion" or "warrior".
31. **O'Riordan:** Descendant of Riordan, meaning "king" or "lord".
32. **O'Shaughnessy:** Descendant of Shaughnessy, meaning "son of the lord".
33. **O'Connor:** Descendant of Connor, meaning "lover of hounds".
34. **O'Daly:** Descendant of Daly, meaning "warrior" or "champion".
35. **O'Farrell:** Descendant of Farrell, meaning "brave" or "strong".
36. **O'Flynn:** Descendant of Flynn, meaning "red-haired" or "fiery".
37. **O'Gara:** Descendant of Gara, meaning "strong" or "valiant".
38. **O'Hara:** Descendant of Hara, meaning "fiery" or "bold".
39. **O'Higgins:** Descendant of Higgins, meaning "son of Hugh".
40. **O'Keefe:** Descendant of Keefe, meaning "handsome" or "fair".
41. **O'Leary:** Descendant of Leary, meaning "bright" or "clear".
42. **O'Malley:** Descendant of Malley, meaning "chief" or "leader".
43. **O'Neill:** Descendant of Niall, meaning "champion" or "cloud".
44. **O'Reilly:** Descendant of Reilly, meaning "valiant" or "strong".
45. **O'Rourke:** Descendant of Rourke, meaning "great king".
46. **O'Shea:** Descendant of Shea, meaning "God is gracious".
47. **O'Sullivan:** Descendant of Sullivan, meaning "black-eyed" or "dark".
48. **O'Toole:** Descendant of Toole, meaning "wolf" or "brave".
49. **O'Tierney:** Descendant of Tierney, meaning "lord" or "ruler".
50. **O'Waly:** Descendant of Waly, meaning "foreigner" or "stranger".