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