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