Last Names Starting with O: A Comprehensive Guide

Looking for a unique and meaningful last name starting with the letter "O"? You've come to the right place! This list compiles a wide array of last names beginning with "O", offering insights into their origins, meanings, and cultural significance. Whether you're searching for a name with a rich history, a modern twist, or simply a distinctive sound, you'll find something to inspire you within this extensive collection.
1. **O'Brien:** Irish origin, meaning "descendant of Brian," a popular Irish king.
2. **O'Connell:** Irish origin, meaning "descendant of Connell," a Gaelic personal name.
3. **O'Neill:** Irish origin, meaning "descendant of Niall," a legendary Irish king.
4. **Oliver:** English origin, meaning "olive tree," symbolizing peace and prosperity.
5. **Owen:** Welsh origin, meaning "noble" or "well-born."
6. **Odell:** English origin, meaning "from the hill by the oak tree."
7. **Odom:** English origin, meaning "from the hill by the oak tree."
8. **Odum:** English origin, meaning "from the hill by the oak tree."
9. **O'Hara:** Irish origin, meaning "descendant of the warrior."
10. **O'Donnell:** Irish origin, meaning "descendant of Donnell," a popular Irish name.
11. **O'Malley:** Irish origin, meaning "descendant of Máel," a Gaelic personal name.
12. **O'Connor:** Irish origin, meaning "descendant of Conchobar," a legendary Irish king.
13. **O'Reilly:** Irish origin, meaning "descendant of Raghallach," a Gaelic personal name.
14. **O'Rourke:** Irish origin, meaning "descendant of Ruarc," a Gaelic personal name.
15. **O'Shaughnessy:** Irish origin, meaning "descendant of Seán Ó Séaghdha," a Gaelic personal name.
16. **O'Sullivan:** Irish origin, meaning "descendant of Súilleabháin," a Gaelic personal name.
17. **O'Toole:** Irish origin, meaning "descendant of Ó Tuathail," a Gaelic personal name.
18. **Odom:** English origin, meaning "from the hill by the oak tree."
19. **O'Malley:** Irish origin, meaning "descendant of Máel," a Gaelic personal name.
20. **O'Neill:** Irish origin, meaning "descendant of Niall," a legendary Irish king.
21. **O'Connor:** Irish origin, meaning "descendant of Conchobar," a legendary Irish king.
22. **O'Reilly:** Irish origin, meaning "descendant of Raghallach," a Gaelic personal name.
23. **O'Rourke:** Irish origin, meaning "descendant of Ruarc," a Gaelic personal name.
24. **O'Shaughnessy:** Irish origin, meaning "descendant of Seán Ó Séaghdha," a Gaelic personal name.
25. **O'Sullivan:** Irish origin, meaning "descendant of Súilleabháin," a Gaelic personal name.
26. **O'Toole:** Irish origin, meaning "descendant of Ó Tuathail," a Gaelic personal name.
27. **O'Brien:** Irish origin, meaning "descendant of Brian," a popular Irish king.
28. **O'Connell:** Irish origin, meaning "descendant of Connell," a Gaelic personal name.
29. **Oliver:** English origin, meaning "olive tree," symbolizing peace and prosperity.
30. **Owen:** Welsh origin, meaning "noble" or "well-born."
31. **Odell:** English origin, meaning "from the hill by the oak tree."
32. **Odum:** English origin, meaning "from the hill by the oak tree."
33. **O'Hara:** Irish origin, meaning "descendant of the warrior."
34. **O'Donnell:** Irish origin, meaning "descendant of Donnell," a popular Irish name.
35. **O'Malley:** Irish origin, meaning "descendant of Máel," a Gaelic personal name.
36. **O'Connor:** Irish origin, meaning "descendant of Conchobar," a legendary Irish king.
37. **O'Reilly:** Irish origin, meaning "descendant of Raghallach," a Gaelic personal name.
38. **O'Rourke:** Irish origin, meaning "descendant of Ruarc," a Gaelic personal name.
39. **O'Shaughnessy:** Irish origin, meaning "descendant of Seán Ó Séaghdha," a Gaelic personal name.
40. **O'Sullivan:** Irish origin, meaning "descendant of Súilleabháin," a Gaelic personal name.
41. **O'Toole:** Irish origin, meaning "descendant of Ó Tuathail," a Gaelic personal name.
42. **Ortiz:** Spanish origin, meaning "golden" or "wealthy."
43. **Ortega:** Spanish origin, meaning "bear."
44. **Osborne:** English origin, meaning "God's house" or "divine dwelling."
45. **Ostroff:** Russian origin, meaning "island" or "isle."
46. **Otto:** German origin, meaning "wealthy" or "prosperous."
47. **Overton:** English origin, meaning "above the town."
48. **Overstreet:** English origin, meaning "over the street."
49. **O'Brien:** Irish origin, meaning "descendant of Brian," a popular Irish king.
50. **O'Connell:** Irish origin, meaning "descendant of Connell," a Gaelic personal name.
51. **O'Neill:** Irish origin, meaning "descendant of Niall," a legendary Irish king.
52. **Oliver:** English origin, meaning "olive tree," symbolizing peace and prosperity.
53. **Owen:** Welsh origin, meaning "noble" or "well-born."
54. **Odell:** English origin, meaning "from the hill by the oak tree."
55. **Odum:** English origin, meaning "from the hill by the oak tree."
56. **O'Hara:** Irish origin, meaning "descendant of the warrior."
57. **O'Donnell:** Irish origin, meaning "descendant of Donnell," a popular Irish name.
58. **O'Malley:** Irish origin, meaning "descendant of Máel," a Gaelic personal name.
59. **O'Connor:** Irish origin, meaning "descendant of Conchobar," a legendary Irish king.
60. **O'Reilly:** Irish origin, meaning "descendant of Raghallach," a Gaelic personal name.
61. **O'Rourke:** Irish origin, meaning "descendant of Ruarc," a Gaelic personal name.
62. **O'Shaughnessy:** Irish origin, meaning "descendant of Seán Ó Séaghdha," a Gaelic personal name.
63. **O'Sullivan:** Irish origin, meaning "descendant of Súilleabháin," a Gaelic personal name.
64. **O'Toole:** Irish origin, meaning "descendant of Ó Tuathail," a Gaelic personal name.