Surname List: Begins with O


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

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1. O'Boyle (2)
2. O'Brien (22)
3. O'Callaghan (1)
4. O'Connell (20)
5. O'Connor (12)
6. O'doherty (1)
7. O'Donnell (2)
8. O'Flahertey (1)
9. O'Gorman (1)
10. O'Grady (2)
11. O'Halloran (2)
12. O'Hara (6)
13. O'Hare (1)
14. O'Keefe (1)
15. O'Keeffe (1)
16. O'Key (1)
17. O'Leary (2)
18. O'Malley (1)
19. O'meagher (3)
20. O'neal (1)
21. O'Neil (4)
22. O'Neill (15)
23. O'reilly (2)
24. O'Rourke (1)
25. O'Shea (2)
26. O'Sullivan (2)
27. O'Toole (3)
28. Oady (1)
29. Oak (1)
   30. Oakden (1)
31. Oake (1)
32. Oakenfold (2)
33. Oakes (4)
34. Oakey (1)
35. Oakley (28)
36. Oaks (2)
37. Oaten (3)
38. Oates (12)
39. Oatis (1)
40. Oatway (2)
41. O’Toole (1)
42. Ober (4)
43. Obern (3)
44. Oberzanek (2)
45. Oborn (14)
46. Obron (1)
47. Ockey (2)
48. Oddy (27)
49. Odell (31)
50. Odem (1)
51. Odgers (12)
52. Odone (1)
53. Oedingen (1)
54. of Aquitaine (1)
55. of Castile (1)
56. of Germany (1)
57. Offer (8)
58. Offord (1)
   59. Offutt (1)
60. Ogden (10)
61. Ogilvie (13)
62. Ogilvy (2)
63. Ogley (2)
64. Ohlson (10)
65. Olafsdatter (1)
66. Old (8)
67. Oldaker (1)
68. Olden (2)
69. Oldfield (6)
70. Oldham (1)
71. Olding (9)
72. Oldland (58)
73. Oldrey (1)
74. Oldring (6)
75. Olejnikac (5)
76. Oler (1)
77. Olesdatter (1)
78. Olfsson (1)
79. Oliver (138)
80. Olsen (3)
81. Olson (3)
82. Olsson (4)
83. Onions (11)
84. Onslow (2)
85. Oppenheimer (6)
86. Oram (61)
87. Orange (1)
   88. Orchard (28)
89. Ordner (1)
90. Orford (2)
91. Orledge (1)
92. Orman (7)
93. Orme (33)
94. Ormond (1)
95. Ormsby (3)
96. Orr (3)
97. Ortlip (1)
98. Orton (10)
99. Ory (1)
100. Osborn (5)
101. Osborne (35)
102. Osell (1)
103. Osland (1)
104. Osment (15)
105. Osmond (4)
106. Ossub (1)
107. Osterhout (2)
108. Ostime (1)
109. Ostle (1)
110. Ostlife (2)
111. Ostlund (1)
112. Oswin (3)
113. Otes (3)
114. Ott (1)
115. Ottaway (1)
116. Otter (29)
   117. Ottewell (1)
118. Otto (2)
119. Oughten (1)
120. Oughton (2)
121. Outlaw (11)
122. Outram (1)
123. Outrim (1)
124. Ovenden (2)
125. Overall (5)
126. Overend (2)
127. Overfield (1)
128. Overman (1)
129. Overson (1)
130. Overton (2)
131. Overy (2)
132. Owen (103)
133. Owens (68)
134. Owers (10)
135. Owsin (1)
136. Oxborow (1)
137. Oxborrow (36)
138. Oxbury (1)
139. Oxland (2)
140. Oxley (4)
141. Oxspring (2)
142. Ozsoydan (2)
143. Ozzard (3)