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Surname List: Begins with O


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

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1. O'Brian (1)
2. O'Brien (19)
3. O'Bryan (1)
4. O'Callaghan (1)
5. O'Connell (2)
6. O'Connor (13)
7. O'Donnell (5)
8. O'Flaherty (1)
9. O'Grady (1)
10. O'Kane (3)
11. O'Keefe (1)
12. O'Keeffe (1)
13. O'Malley (1)
14. O'Neill (3)
15. O'Reardon (1)
16. O'Shea (3)
17. O'Sullivan (2)
18. O'Toole (1)
19. Oakes (6)
20. Oakey (2)
21. Oakley (16)
22. Oakman (1)
23. Oates (3)
24. Oatley (6)
25. Obbard (12)
26. Ockwell (2)
27. Oddy (1)
28. Odell (2)
29. Odiam (1)
   30. Odlum (1)
31. Ody (1)
32. Oehlert (1)
33. Oelberg (1)
34. Offley (2)
35. Offord (1)
36. Ogan (1)
37. Ogborn (1)
38. Ogden (7)
39. Ohrlund (1)
40. Ohronon (1)
41. Ohrtgies (1)
42. Okes (1)
43. Okewood (1)
44. Oki (1)
45. Olcott (2)
46. Old (15)
47. Olden (1)
48. Oldfather (1)
49. Oldfield (13)
50. Oldham (1)
51. Oldridge (5)
52. Olds (2)
53. Oldsage (1)
54. Oles (2)
55. Oliphant (9)
56. Oliver (39)
57. Olives (1)
58. Ollard (1)
   59. Ollett (1)
60. Olley (1)
61. Olliff (1)
62. Olliffe (4)
63. Olliver (1)
64. Olney (1)
65. Olsen (8)
66. Olson (2)
67. Olsovinek (1)
68. Olsson (1)
69. Olver (1)
70. Omick (1)
71. Onion (1)
72. Onions (5)
73. Open (4)
74. Openshaw (1)
75. Oquist (1)
76. Oram (1)
77. Orchard (16)
78. Orcutt (1)
79. Ord (3)
80. Orender (3)
81. Orendorf (1)
82. Orford (1)
83. Organ (1)
84. Orgles (2)
85. Orman (1)
86. Orme (1)
87. Ormesher (1)
   88. Ormston (1)
89. Orphin (1)
90. Orr (1)
91. Orrell (1)
92. Orrow (1)
93. Orsini (2)
94. Orton (3)
95. Orwin (3)
96. Osborn (4)
97. Osborne (40)
98. Oscroft (1)
99. Osgood (4)
100. Osman (8)
101. Osmond (1)
102. Ostle (1)
103. Ostrander (2)
104. Ostrom (1)
105. Oswick (4)
106. Oswold (1)
107. Otis (1)
108. Ott (6)
109. Ottaway (1)
110. Ottignon (10)
111. Ottley (1)
112. Otwell (1)
113. Oudot (1)
114. Ouellette (1)
115. Oughton (1)
116. Ould (2)
   117. Oulton (1)
118. Ousby (1)
119. Ousley (1)
120. Outlaw (1)
121. Outram (1)
122. Outz (1)
123. Ovenden (2)
124. Ovenell (1)
125. Ovens (2)
126. Over (2)
127. Overbury (1)
128. Overett (1)
129. Overholz (1)
130. Overnell (4)
131. Overton (13)
132. Overy (4)
133. Ovnell (1)
134. Owen (30)
135. Owen-Smith (1)
136. Owens (1)
137. Owles (1)
138. Oxford (1)
139. Oxlade (3)
140. Oxley (7)
141. Oxtoby (1)
142. Oyston (1)