Surname List: Begins with O: MontyHistNotes

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

1. O (1)
2. O Brien (3)
3. O'Banion (1)
4. O'Bannon (3)
5. O'Briant (1)
6. O'Brien (17)
7. O'Bryan (2)
8. O'Bryant (1)
9. O'Byrne (1)
10. O'Carrol (1)
11. O'Cathan (2)
12. O'Connell (9)
13. O'Conner (1)
14. O'Connor (8)
15. O'Connors (1)
16. O'Daniel (3)
17. O'Day (5)
18. O'Dell (5)
19. O'Donley (2)
20. O'Donnell (4)
21. O'Grady (1)
22. O'Guinn (1)
23. O'Hair (1)
24. O'Hanlon (1)
25. O'Hara (1)
26. O'Hearn (1)
27. O'Holeran Pritchard (1)
28. O'Kelly (2)
29. O'Leary (2)
30. O'Malley (1)
31. O'Mara (3)
32. O'Neal (15)
33. O'Neil (3)
34. O'Neill (3)
35. O'Neille (1)
36. O'Rourke (4)
37. O'Steen (1)
38. O'Sullivan (1)
39. Oakes (5)
40. Oakes Lawrence (1)
41. Oakley (18)
42. Oates (3)
43. Obama (2)
44. Obenshain (1)

45. Oberholser (1)
46. Oberholtzer (3)
47. Oberkorn (3)
48. Oberlander (2)
49. Oberle (1)
50. Obermire (1)
51. Obrien (1)
52. Ocheltree (1)
53. Ocher (1)
54. Ochsenbein (1)
55. Odaniel (1)
56. Oday (1)
57. Odell (3)
58. Oden (4)
59. Odham (1)
60. Odle (1)
61. Odom (4)
62. Odor (1)
63. Odum (2)
64. Oehler (6)
65. Of Leinster (2)
66. of Maine (2)
67. of Mar (1)
68. Of Mercia (2)
69. Of Scotland (7)
70. Of Wessex (1)
71. Offner (1)
72. Offringa (1)
73. Ogden (4)
74. Ogg (2)
75. Ogilvy (10)
76. Ogle (22)
77. Ogle Moore (1)
78. Oglesby (3)
79. Ogletree (2)
80. Ohair (1)
81. Ohlson (1)
82. Ohman (1)
83. Ohmart (2)
84. Oie (1)
85. Okray (1)
86. Olack (1)
87. Olafsdatter (4)
88. Olafsson (2)

89. Olarrea (3)
90. Oldaker (1)
91. Oldenburg (12)
92. Oldfield (1)
93. Oldham (8)
94. Oldman (1)
95. Olds (3)
96. Olen (1)
97. Olfers (1)
98. Olham (1)
99. Olhausen (1)
100. Oliger (2)
101. Olinger (1)
102. Olio (1)
103. Oliphant (9)
104. Olive (4)
105. Oliver (37)
106. Ollis (5)
107. Olmstead (8)
108. Olmsted (6)
109. Olofsdotter (1)
110. Olsen (12)
111. Olson (9)
112. Oman (2)
113. Omohundro (2)
114. Oncale (1)
115. Oneal (3)
116. Onesi (1)
117. Ong (1)
118. Only (1)
119. Onstott (3)
120. Ontl (1)
121. Opal (1)
122. Opdyke (1)
123. Oram (1)
124. Orander (1)
125. Orange (4)
126. Orboda (1)
127. Orcutt (2)
128. Ord (1)
129. Orebaugh (1)
130. Oreilly (1)
131. Orem (2)
132. Orgain (1)

133. Orkney (2)
134. Orlean (1)
135. Orman (2)
136. Ormand (2)
137. Orme (1)
138. Ormiston (1)
139. Ormond (1)
140. Ormondie (1)
141. Ormsby (5)
142. Ornduff (1)
143. Orne (2)
144. Orona (1)
145. Orozco (1)
146. Orr (396)
147. Orrick (2)
148. Orser (1)
149. Orsik (3)
150. Ortagus (1)
151. Orth (1)
152. Ortiz (2)
153. Orto (2)
154. Orton (1)
155. Orwig (1)
156. Osborn (41)
157. Osborn White (1)
158. Osborne (63)
159. Osburn (2)
160. Osgood (2)
161. Oshman (1)
162. Oslac (1)
163. Osler (2)
164. Osmer (1)
165. Osmon (1)
166. Osmun (1)
167. Ossory (4)
168. Ostaggi (1)
169. Osteen (7)
170. Ostenberg (2)
171. Oster (4)
172. Osterburg (1)
173. Osterloo (1)
174. Osterman (1)
175. Osterstock (1)
176. Ostheimer (2)

177. Oswald (6)
178. Otero Marrero (1)
179. Otis (1)
180. Otlipp (1)
181. Otstot (1)
182. Ott (22)
183. Ottarsson (2)
184. Otto (3)
185. Ouderkirk (1)
186. Oulton (1)
187. Ours (1)
188. Ousley (1)
189. Ousterbought (1)
190. Outland (5)
191. Outlaw (2)
192. Outten (4)
193. Ovard (1)
194. Overall (3)
195. Overbay (1)
196. Overby (5)
197. Overcash (28)
198. Overfelt (1)
199. Overholt (1)
200. Overholtzer (1)
201. Overman (3)
202. Overmyer (1)
203. Overstreet (24)
204. Overton (5)
205. Oves (1)
206. Ovitt (1)
207. Owen (36)
208. Owen Southern (1)
209. Owenby (3)
210. Owens (51)
211. Oxby (1)
212. Oxer (1)
213. Oxford (4)
214. Oxley (6)
215. Oyer (1)
216. Oylear (3)
217. Oyler (4)
218. Oyster (1)
219. Ozias (2)
220. Ozment (5)