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Surname List: Begins with O


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

1. O'Brian (1)
2. O'Brien (39)
3. O'Bryan (1)
4. O'Byrne (4)
5. O'Callaghan (1)
6. O'Connell (10)
7. O'Connor (22)
8. O'Dee (1)
9. O'Dell (1)
10. O'Donnell (13)
11. O'Donoghue (1)
12. O'Driscoll (1)
13. O'Farrell (1)
14. O'Flaherty (1)
15. O'Flynn (1)
16. O'Gara (1)
17. O'Gorman (3)
18. O'Grady (2)
19. O'Halloran (2)
20. O'Hanlon (1)
21. O'Hara (1)
22. O'Kane (10)
23. O'Keefe (1)
24. O'Keeffe (1)
25. O'Kelly (1)
26. O'Mahony (1)
27. O'Malley (2)
28. O'Mara (2)
29. O'Meara (1)
30. O'Neil (1)
31. O'Neill (16)
32. O'Reardon (1)
33. O'Reilly (7)
34. O'Rourke (9)
35. O'Shaughnessy (1)
36. O'Shea (4)
37. O'Sullivan (4)
38. O'Toole (1)
39. Oakes (45)
40. Oakey (2)
41. Oakhill (1)
42. Oakley (25)
43. Oakman (2)
44. Oakton (2)
45. Oaten (2)
46. Oates (4)
47. Oatley (7)
   48. Obbard (16)
49. Obenauf (1)
50. Obern (1)
51. Oberschelp (1)
52. Oberting (1)
53. Obetts (1)
54. Oblisk (1)
55. Obourne (4)
56. Occleston (1)
57. Ockwell (3)
58. Oddie (1)
59. Oddy (3)
60. Odell (9)
61. Odiam (1)
62. Odlum (1)
63. Ody (1)
64. Oehlert (1)
65. Oelberg (1)
66. Oesterlein (2)
67. Oeverdieck (1)
68. Offen (1)
69. Offley (2)
70. Offord (1)
71. Ogan (1)
72. Ogarro (1)
73. Ogborn (2)
74. Ogborne (1)
75. Ogden (17)
76. Ogdon (1)
77. Ogilvie (4)
78. Ogleby (1)
79. Ogley (4)
80. Ohrlund (1)
81. Ohronon (1)
82. Ohrtgies (1)
83. Oja (1)
84. Oke (5)
85. Okewood (1)
86. Oki (2)
87. Oland (1)
88. Olby (1)
89. Olcott (3)
90. Old (16)
91. Olden (1)
92. Oldershaw (3)
93. Oldfather (1)
94. Oldfield (28)
   95. Oldford (1)
96. Oldham (3)
97. Olding (5)
98. Oldridge (7)
99. Olds (9)
100. Oldsage (1)
101. Oles (2)
102. Oliphant (9)
103. Oliver (91)
104. Oliver-House (2)
105. Olivere (1)
106. Olives (1)
107. Olivo (1)
108. Ollard (1)
109. Ollett (2)
110. Olley (2)
111. Ollie (1)
112. Olliff (1)
113. Olliffe (6)
114. Olliver (1)
115. Olmstead (1)
116. Olmsted (1)
117. Olney (2)
118. Olsen (12)
119. Olson (15)
120. Olsovinek (1)
121. Olsson (1)
122. Olstead (1)
123. Olver (1)
124. Omick (1)
125. Omidi (1)
126. Ong (1)
127. Onion (1)
128. Onions (10)
129. Onofrychuk (1)
130. Oodit (1)
131. Oots (12)
132. Open (13)
133. Openshaw (7)
134. Oquist (1)
135. Oram (6)
136. Oran (2)
137. Orange (1)
138. Orchard (26)
139. Orcutt (3)
140. Ord (4)
141. Ordish (1)
   142. Oren (1)
143. Orender (3)
144. Orendorf (1)
145. Orford (1)
146. Organ (3)
147. Orgles (2)
148. Orick (1)
149. Orlando (1)
150. Orman (4)
151. Ormand (1)
152. Orme (5)
153. Ormesher (2)
154. Ormston (2)
155. Orphin (1)
156. Orr (6)
157. Orrell (1)
158. Orrid (1)
159. Orriss (2)
160. Orrow (3)
161. Orsborn (1)
162. Orser (3)
163. Orsini (2)
164. Orton (8)
165. Orwin (3)
166. Osborn (10)
167. Osborne (85)
168. Osbourn (2)
169. Osbourne (1)
170. Oscroft (5)
171. Osgood (6)
172. Osler (5)
173. Osman (10)
174. Osmond (3)
175. Osterhout (1)
176. Ostle (4)
177. Ostler (3)
178. Ostrancer (1)
179. Ostrander (3)
180. Ostrom (1)
181. Oswald (1)
182. Oswick (4)
183. Oswold (1)
184. Otis (3)
185. Ott (9)
186. Ottaway (2)
187. Ottignon (10)
188. Ottley (1)
   189. Otto (1)
190. Otwell (1)
191. Oualline (1)
192. Ouderkerk (1)
193. Ouderkirk (1)
194. Oudot (1)
195. Ouellette (2)
196. Oughton (1)
197. Ould (2)
198. Oulette (1)
199. Oulton (1)
200. Ousby (1)
201. Ousley (1)
202. Outhwaite (1)
203. Outlaw (2)
204. Outram (1)
205. Outz (1)
206. Ovenden (2)
207. Ovenell (1)
208. Ovens (3)
209. Over (7)
210. Overbey (1)
211. Overbury (1)
212. Overby (1)
213. Overett (1)
214. Overholser (5)
215. Overholz (1)
216. Overlook (1)
217. Overman (1)
218. Overnell (4)
219. Overton (23)
220. Overy (14)
221. Ovnell (1)
222. Owen (57)
223. Owen-Smith (2)
224. Owens (14)
225. Owens-Smith (1)
226. Owles (1)
227. Ownby (1)
228. Ownes (1)
229. Oxby (1)
230. Oxford (3)
231. Oxlade (7)
232. Oxley (11)
233. Oxtoby (3)
234. Oyston (1)