| 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 (2,165) | Oliver (1,313) | Olson (1,199) |
| Osborne (883) | Ortiz (872) | Owen (801) |
| O'Brien (687) | Orr (594) | Olsen (558) |
| Odom (518) | O'Connor (456) | Osborn (449) |
| Ortega (430) | Ott (424) | O'Neill (360) |
| O'Neal (299) | Ogden (282) | O'Donnell (273) |
| Otto (236) | Ochoa (232) | Oakley (226) |
| O'Dell (221) | Odell (211) | Ogle (210) |
| O'Connell (208) | Of Egypt (206) | Oldham (199) |
| Overton (199) | O'Neil (192) | Oakes (179) |
| Overstreet (172) | Oswald (171) | Oneal (167) |
| Obrien (163) | Of The Franks (136) | Of Argos (134) |
| Of Assyria (132) | Osgood (130) | Osburn (122) |
| Of Thessaly (121) | Orozco (121) | O'Leary (119) |
| Oates (118) | Olds (114) | O'Rourke (113) |
