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