143 Last Names that Start with ‘O’

Many last names that start with the letter O have an air of optimism and positivity. When spoken, the letter O gives a very open, inviting sound. Below, we list some of the most common last names that begin with O.

Why Choose a Last Name Beginning with O?

The letter O has a deep, booming tone. Many last names in the United States start with O’ (O followed by an apostrophe). The suffix of O’ originates in the Irish and Gaelic languages and means ‘grandson/descendant of.’ So, for example, the last name O’Connor means ‘grandson or descendant of Connor.’ Other surnames starting with O in the US include names with Scandinavian origins, such as Olson, and names with Hispanic roots, such as Ortiz. Popular last names in the US, starting with O, include Owens, Ortega, Oliver, Ochoa, and Osborne. Unique last names beginning with O include Oakes, Oakley, Olivier, Onyx, and Orleans.

Many exciting surnames start with O if you need help finding a creative last name for your family or fictional character.

Last Names Starting with O

Uncover the top surnames starting with O with this complete list below. Here you will find a list of surnames that begin with OA, sorted by popularity, from most to least popular.

1. Ortiz
2. Owens
3. Olson
4. Ortega
5. Oliver
6. Ochoa
7. Osborne
8. Orozco
9. Owen
10. Olsen
11. Oneill
12. Oneal
13. Orr
14. Odom
15. Osborn
16. Odell
17. Osorio
18. Oneil
19. Olvera
20. Orellana
21. Ott
22. Ocampo
23. Olivares
24. Ornelas
25. Otto
26. Oleary
27. Ojeda
28. Otero
29. Olivas
30. Oliva
31. Oliveira
32. Ogden
33. Overton
34. Ordonez
35. Oh
36. Omalley
37. Oakes
38. Oakley
39. Orourke
40. Ontiveros
41. Ogle
42. Oswald
43. Ouellette
44. Oldham
45. Orlando
46. Overstreet
47. Oglesby
48. Oates
49. Oreilly
50. Otoole
51. Olguin
52. Oshea
53. Olivo
54. Osman
55. Olmos
56. Olivarez
57. Ong
58. Ostrander
59. Ocasio
60. Olivera
61. Outlaw
62. Orosco
63. Oden
64. Oviedo
65. Olmstead
66. Orta
67. Ordaz
68. Ovalle
69. Olds
70. Omar
71. Osuna
72. Osburn
73. Otis
74. Ogrady
75. Oaks
76. Oxendine
77. Oropeza
78. Oakry
79. O’Bear
80. O’Brien
81. O’Connor
82. Oestreich
83. Oghagbon
84. Ogier
85. Okeke
86. Okwilagwe
87. Olaeta
88. Olagbaju
89. Olczak
90. Oloyede
91. Olverson
92. Omdahl
93. Omozee
94. O’Neal
95. O’Neill
96. Onwuka
97. Onyenwere
98. Oramas
99. Orji
100. Orth




101. Outlow
102. Outten
103. Overbeck
104. O’Brien
105. O’Connor
106. O’Neill
107. O’Sullivan
108. O’Boyle
109. O’Cahan
110. O’Callaghan
111. O’Casey
112. O’Clery
113. O’Connell
114. Octavius
115. O’Day
116. O’Dea
117. O’Dell
118. O’Donovan
119. O’Driscoll
120. O’Farrell
121. O’Friel
122. Ogilvie
123. Ogilvy
124. O’Hagan
125. O’Halloran
126. O’Hara
127. O’Hare
128. O’Hea
129. O’Higgins
130. O’Keefe
131. Olivier
132. Ollivier
133. O’Loughlin
134. Olympia
135. O’Lynn
136. O’Reilly
137. O’Riordan
138. O’Shaughnessy
139. O’Sheehan
140. O’Sullivan
141. O’Toole
142. O’Donnell
143. Ozzy

See 5,000 Most Common Last Names