Surname List: Begins with O: My Family History

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All surnames beginning with O, sorted alphabetically (total individuals):

1. O'Bannon (1)
2. O'Berry (1)
3. O'Brian (1)
4. O'Briant (1)
5. O'Brien (5)
6. O'Bryan (1)
7. O'Bryant (1)
8. O'Byrne (1)
9. O'Callagahan (3)
10. O'Cathan (3)
11. O'Connell (2)
12. O'Connor (2)
13. O'Dell (1)
14. O'Donnal (2)
15. O'Hara (2)
16. O'Hare (1)
17. O'Keefe (1)
18. O'Malley (1)
19. O'Moore (1)
20. O'Neal (3)
21. O'Neale (2)
22. O'Neel (5)
23. O'Neil (7)
24. O'Neill (16)
25. O'Reilly (1)
26. O'Rielly (2)
27. O'Rourke (1)
28. O'Shaunnessy (1)
29. O'Shea (1)
30. O'Steen (1)
31. O'Toole (7)
32. Oakley (4)
33. Oates (2)
34. Obenskey (3)
35. Ober (3)
36. Obert (2)
37. Obotrides (1)

38. Ochoa (9)
39. Octavius (3)
40. Odden (1)
41. Odendahl (1)
42. Odette (1)
43. Odinsson (2)
44. Oestreich (1)
45. of Alemania (1)
46. of Aquitaine (1)
47. of Bavaria (2)
48. of Castile (1)
49. of Cornouaille (1)
50. Of Flanders (1)
51. of Gascony (1)
52. of Italy (1)
53. of Lancaster (1)
54. of Lorraine (2)
55. of Lotharingia (1)
56. of Penthièvre (2)
57. of Roucy (1)
58. of Saxony (1)
59. of Sicily (1)
60. of the Ostrogoths (1)
61. of Toulouse (1)
62. of Valois (1)
63. of Vermandois (2)
64. Officer (4)
65. Ogan (59)
66. Ogden (7)
67. Ogilvee (1)
68. Ogilvie (2)
69. Ogilvy (2)
70. Ogle (1)
71. Oglesby (2)
72. Ogletree (1)
73. Oglivie (1)
74. Ogram (1)

75. Ohl (2)
76. Ohnesorgen (1)
77. Ohningen (1)
78. Oissard (1)
79. Olafsdatter (3)
80. Olafsdottir (2)
81. Olafsen Teiste Bjelland (1)
82. Olafsson (8)
83. Olcott (1)
84. Oldham (9)
85. Olds (6)
86. Oleson (2)
87. Oliba (1)
88. Oliphant (8)
89. Olivas (3)
90. Olive (1)
91. Oliver (21)
92. Olmstead (8)
93. Olmsted (1)
94. Olphant (1)
95. Olphers (1)
96. Olsen (8)
97. Olsen Nardsteien (1)
98. Olson (14)
99. Olsson (7)
100. Ome (1)
101. Omohundro (4)
102. Onundsson (1)
103. Oothout (1)
104. Oppfelt (1)
105. Orabilis (1)
106. Orange (1)
107. Orchard (7)
108. Ordogno (1)
109. Orlando (1)
110. Ormsby (2)
111. Orne (1)

112. Oros (2)
113. Orosco (7)
114. Orourke (1)
115. Orr (72)
116. Orsheln (1)
117. Orsini (5)
118. Ort (2)
119. Ortega (4)
120. Ortega Villanueva (1)
121. Ortis Ojeda (1)
122. Ortiz (258)
123. Ortiz Barba Coronado (1)
124. Ortiz Corella (1)
125. Ortiz Coronado (2)
126. Ortiz Cortez (23)
127. Ortiz Cortez del Rey (1)
128. Ortiz de Guevara (1)
129. Ortiz de Leon (1)
130. Ortiz de los Reyes (2)
131. Ortiz de los Reyes de Leon (1)
132. Ortíz Ladrón de Guevara (1)
133. Ortiz Orosco (1)
134. Ortiz Vejar (1)
135. Orvis (3)
136. Osborn (6)
137. Osborne (30)
138. Osburn (2)
139. Osgood (3)
140. Osland (1)
141. Ossory (1)
142. Osterhaut (1)
143. Osterhoudt (1)
144. Ostern (5)
145. Ostlie (6)
146. Ostlund (1)
147. Oswulf (1)
148. Otenbreit (1)

149. Otero (81)
150. Otero Contreras (1)
151. Otero Granillo (1)
152. Otey (85)
153. Otis (1)
154. Ott (3)
155. Ottarsson (1)
156. Otter (3)
157. Ottley (1)
158. Ottman (1)
159. Otto (3)
160. Ouderkerk (4)
161. Ouderkirk (5)
162. Oughtrington (1)
163. Oulton (2)
164. Ours (1)
165. Ouseley (1)
166. Outhouse (2)
167. Over-Qvåle (1)
168. Overby (5)
169. Overlin (1)
170. Overstreet (11)
171. Overton (80)
172. Oviatt (144)
173. Owen (24)
174. Owens (28)
175. Owing (1)
176. Owings (2)
177. Owlsley (1)
178. Ownbey (2)
179. Owsley (4)
180. Oyler (1)
181. Oyster (1)
182. Ozier (1)