Surname List: Begins with O: Our Family History

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

1. O'Bier (1)
2. O'Brien (4)
3. O'Callaghan (1)
4. O'Conner (3)
5. O'Connor (6)
6. O'Dell (2)
7. O'Donnell (4)
8. O'Donovan (1)
9. O'Gorman (1)
10. O'Halloran (1)
11. O'Hara (1)
12. O'Keeffe (2)
13. O'Leary (1)
14. O'Malley (1)
15. O'Meara (1)
16. O'Mullane (1)
17. O'Neal (22)
18. O'Neil (1)
19. O'Neill (1)
20. O'Rear (1)
21. O'Rourke (1)
22. O'Shea (1)
23. O'Sullivan (1)
24. O'Tremba (1)
25. Oakes (1)
26. Oakley (55)
27. Oaks (2)

28. Oakton (1)
29. Oare (8)
30. Oary (1)
31. Oates (1)
32. Oatiss (2)
33. Oberhaus (1)
34. Oberholtzer (1)
35. Oberlin (7)
36. Ochs (2)
37. Ockerhausen (3)
38. Ockrymiek (2)
39. Odell (2)
40. Oden (6)
41. Odlin (1)
42. Odom (1)
43. Odorsey (5)
44. Oehmke (3)
45. Oertel (1)
46. Oese (1)
47. Ogara (1)
48. Ogden (21)
49. Ogle (1)
50. Oglesbee (1)
51. Ohara (1)
52. Ohlman (5)
53. Ohman (1)
54. Ohrt (1)

55. Okopski (4)
56. Olcott (1)
57. Oldenburg (2)
58. Oldfield (1)
59. Oldham (7)
60. Olds (6)
61. Olendorf (1)
62. Oleson (3)
63. Olin (3)
64. Oliphant (3)
65. Oliver (13)
66. Oliveros (3)
67. Oliviera (1)
68. Olmstead (2)
69. Olmsted (6)
70. Olsen (8)
71. Olson (1)
72. Olveda (1)
73. Omara (1)
74. Omlore (1)
75. Onby (1)
76. Onderdonk (6)
77. Oneson (1)
78. Ong (1)
79. Ono (1)
80. Ontai (1)
81. Oona (1)

82. Opliger (4)
83. Opp (1)
84. Orchanian (3)
85. Orchard (1)
86. Ordway (23)
87. Oren (1)
88. Orenson (1)
89. Orgain (1)
90. Oriel (1)
91. Orkey (1)
92. Orman (30)
93. Ormo (1)
94. Ormsby or Ormsbee (1)
95. Orr (5)
96. Orris (4)
97. Orton (8)
98. Orvis (2)
99. Osborn (17)
100. Osborne (21)
101. Osbourn (1)
102. Osssit (3)
103. Osten (1)
104. Oster (1)
105. Osterhoudt (1)
106. Ostler (4)
107. Ostrander (1)
108. Oswald (1)

109. Ota (1)
110. Otis (11)
111. Ott (32)
112. Otte (1)
113. Otter (7)
114. Otters (1)
115. Otterson (1)
116. Otto (7)
117. Ottum (1)
118. Otway (5)
119. Ouillette (1)
120. Outhouse (23)
121. Overacker (1)
122. Overall (6)
123. Overbey (3)
124. Overcash (1)
125. Overholser (1)
126. Overington (1)
127. Overman (7)
128. Overton (4)
129. Overtton (1)
130. Owen (69)
131. Owens (16)
132. Oxley (3)