| Owens (721,236) | Olson (700,625) | Ortiz (647,995) |
| Oliver (486,763) | Obrien (362,175) | Owen (323,875) |
| Ortega (245,100) | Olsen (232,489) | Osborne (228,564) |
| Ones (210,992) | Orr (197,549) | Oconnor (196,027) |
| Osborn (178,417) | O'Brien (177,501) | Oneal (145,602) |
| Ochoa (140,700) | Ott (128,141) | Oneill (123,138) |
| Odell (116,703) | Oneil (116,540) | Odonnell (115,345) |
| Orozco (105,980) | Odom (102,930) | Oconnell (97,970) |
| Otto (96,532) | O'Connor (93,603) | Ong (89,532) |
| Ogden (83,287) | Overton (68,769) | Oakley (67,385) |
| Orris (62,825) | Oakes (58,153) | O'Donnell (57,186) |
| Oleson (56,042) | Oleary (55,895) | Ogle (55,687) |
| Ohara (54,802) | Organ (54,468) | Orton (53,841) |
| O'Neil (53,600) | O'Neill (52,517) | O'Connell (52,325) |
| Oswald (51,123) | Oldham (50,823) | Osorio (48,390) |
| Otero (45,907) | Olvera (43,345) | Okeefe (42,925) |
| Overstreet (42,418) | Orres (42,026) | Obinson (41,859) |
| Orales (41,287) | Oliveira (40,206) | Orellana (39,886) |
| Olivares (39,737) | Oster (39,550) | Orourke (39,087) |
| Ostrander (38,911) | Omalley (38,208) | Otis (37,785) |
| Oglesby (37,783) | Ojeda (36,639) | Ocampo (35,719) |
| Oates (35,589) | Oconner (35,345) | Olmstead (35,323) |
| Ornelas (35,009) | Osgood (34,331) | Orlando (34,170) |
| O'Neal (33,848) | Olivas (33,615) | Oliva (33,575) |
| Osburn (33,365) | Ouellette (32,569) | Omez (32,363) |
| Olds (30,276) | Oaks (29,494) | O'Leary (29,015) |
| Oss (28,785) | Oden (27,828) | Ordonez (26,965) |
| Orth (26,879) | O'Hara (25,191) | Ontiveros (23,842) |
| Osullivan (23,691) | Outlaw (23,630) | Oreilly (23,468) |
| Otoole (22,824) | Ortez (22,609) | Oberts (22,522) |
| O'Keefe (22,268) | O'Rourke (21,327) | Ogers (21,315) |
| Oshea (21,038) | Ollins (20,849) | Oung (20,298) |
| Olive (20,223) | Oman (19,911) | Obrian (19,896) |
| Owens (2,182) | Oliver (1,313) | Olson (1,201) |
| Osborne (895) | Ortiz (880) | Owen (808) |
| O'Brien (693) | Orr (595) | Olsen (560) |
| Odom (519) | O'Connor (456) | Osborn (454) |
| Ortega (432) | Ott (426) | O'Neill (360) |
| O'Neal (299) | Ogden (283) | O'Donnell (275) |
| Otto (236) | Ochoa (234) | O'Dell (233) |
| Ogle (228) | Oakley (227) | Of Egypt (212) |
| Odell (212) | O'Connell (208) | Overton (199) |
| Oldham (199) | O'Neil (193) | Oakes (179) |
| Overstreet (175) | Oswald (171) | Oneal (168) |
| Obrien (166) | Of Assyria (144) | Of Argos (138) |
| Of The Franks (136) | Osgood (131) | O'Leary (124) |
| Of Sparta (123) | Osburn (122) | Orozco (121) |
| Of Thessaly (121) | Oates (119) | Olds (114) |
