Surname List: Begins with O: Howes Howse House and Hows Surname Families Worldwide : Family History (Tree) and Genealogy

The study into the Howes/Howse/Hows and House names is registered with the Guild of One-Name Studies.

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

1. O'Brian (1)
2. O'Brien (41)
3. O'Bryan (1)
4. O'Byrne (4)
5. O'Callaghan (1)
6. O'Connell (10)
7. O'Connor (23)
8. O'Dee (1)
9. O'Dell (2)
10. O'Donnell (14)
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 (13)
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. Obenauf (1)
54. Obern (1)
55. Oberschelp (1)
56. Oberting (1)
57. Obetts (1)
58. Oblisk (1)
59. Obourne (4)
60. Occleston (1)
61. Ockwell (3)
62. Oddie (1)
63. Oddy (4)
64. Odell (13)
65. Oden (1)
66. Odiam (1)
67. Odlum (1)
68. Odom (1)
69. Ody (1)
70. Oehlert (1)
71. Oelberg (1)
72. Oesterlein (2)
73. Oeverdieck (1)
74. Offen (1)
75. Offer (2)
76. Offley (2)
77. Offord (11)
78. Ogan (1)
79. Ogarro (1)
80. Ogborn (2)
81. Ogborne (1)
82. Ogden (17)
83. Ogdon (1)
84. Ogilvie (4)
85. Ogleby (1)
86. Ogley (4)
87. Ohrlund (1)
88. Ohronon (1)
89. Ohrtgies (1)
90. Oja (1)
91. Oke (5)
92. Okewood (1)
93. Oki (2)
94. Oland (1)
95. Olby (1)
96. Olcott (3)
97. Old (24)
98. Olden (1)
99. Oldershaw (3)
100. Oldfather (1)

101. Oldfield (28)
102. Oldford (1)
103. Oldham (4)
104. Olding (5)
105. Oldridge (7)
106. Olds (9)
107. Oldsage (1)
108. Oles (2)
109. Oleskey (3)
110. Oliphant (9)
111. Oliver (96)
112. Oliver-House (2)
113. Olivere (1)
114. Olives (1)
115. Olivo (1)
116. Ollard (1)
117. Ollerenshaw (3)
118. Ollett (2)
119. Olley (3)
120. Ollie (1)
121. Olliff (1)
122. Olliffe (6)
123. Olliver (1)
124. Olmstead (1)
125. Olmsted (1)
126. Olney (2)
127. Olsen (13)
128. Olson (16)
129. Olsovinek (1)
130. Olsson (1)
131. Olstead (1)
132. Olver (1)
133. Omick (1)
134. Omidi (1)
135. Ong (1)
136. Onion (1)
137. Onions (10)
138. Onofrychuk (1)
139. Oodit (1)
140. Oots (12)
141. Open (13)
142. Openshaw (7)
143. Oquist (1)
144. Oram (7)
145. Oran (2)
146. Orange (1)
147. Orchard (26)
148. Orcutt (3)
149. Ord (4)
150. Ordish (1)

151. Oren (1)
152. Orender (3)
153. Orendorf (1)
154. Orford (1)
155. Organ (3)
156. Orgles (2)
157. Orick (1)
158. Orlando (1)
159. Orledge (1)
160. Orman (4)
161. Ormand (1)
162. Orme (5)
163. Ormesher (2)
164. Ormston (3)
165. Orpen (1)
166. Orphin (1)
167. Orr (6)
168. Orrell (1)
169. Orrid (1)
170. Orriss (2)
171. Orrow (3)
172. Orsborn (1)
173. Orser (3)
174. Orsini (2)
175. Orth (1)
176. Orton (8)
177. Orwin (3)
178. Osborn (12)
179. Osborne (86)
180. Osbourn (2)
181. Oscroft (5)
182. Osgood (5)
183. Osler (5)
184. Osman (10)
185. Osmond (3)
186. Osterhout (1)
187. Ostle (4)
188. Ostler (3)
189. Ostrancer (1)
190. Ostrander (3)
191. Ostrom (1)
192. Oswald (1)
193. Oswick (4)
194. Oswold (1)
195. Otis (3)
196. Ott (10)
197. Ottaway (2)
198. Ottignon (10)
199. Ottley (1)
200. Otto (1)

201. Otwell (1)
202. Oualline (1)
203. Ouderkerk (1)
204. Ouderkirk (1)
205. Oudot (1)
206. Ouellet (1)
207. Ouellette (2)
208. Oughton (1)
209. Oulette (1)
210. Oulton (1)
211. Ousby (1)
212. Ousley (1)
213. Outhwaite (1)
214. Outlaw (2)
215. Outram (1)
216. Outz (1)
217. Ovenden (2)
218. Ovenell (1)
219. Ovens (3)
220. Over (7)
221. Overbey (1)
222. Overbury (1)
223. Overby (1)
224. Overett (1)
225. Overholser (5)
226. Overholz (1)
227. Overlook (1)
228. Overman (1)
229. Overnell (4)
230. Overton (23)
231. Overy (19)
232. Ovnell (1)
233. Owen (68)
234. Owen-Smith (2)
235. Owens (17)
236. Owens-Smith (1)
237. Owers (3)
238. Owles (1)
239. Ownby (1)
240. Ownes (1)
241. Oxby (1)
242. Oxford (3)
243. Oxlade (7)
244. Oxley (12)
245. Oxtoby (3)
246. Oyston (1)