| Underwood (182,566) | Ulrich (67,567) | Urban (60,321) |
| Upton (54,851) | Unger (54,784) | Uribe (40,763) |
| Underhill (32,163) | Utierrez (30,831) | Upchurch (29,622) |
| Ulmer (29,089) | Utley (25,237) | Urner (24,305) |
| Usher (24,166) | Urphy (23,195) | Uhl (23,110) |
| Urbina (22,263) | Utter (21,344) | Uiz (19,456) |
| Utz (19,246) | Ulloa (18,306) | Upshaw (17,407) |
| Unruh (16,650) | Uzman (15,243) | Ullivan (15,018) |
| Uez (14,607) | Unoz (13,183) | Urena (12,437) |
| Urray (11,803) | Ussery (11,698) | Ullrich (11,378) |
| Ughes (11,302) | Urquhart (11,002) | Utterback (10,807) |
| Updike (10,772) | Ung (10,755) | Urias (10,721) |
| Upham (10,640) | Ullman (10,586) | Utler (10,368) |
| Urrutia (9,969) |
| Unknown (1,554) | Underwood (831) | Upton (267) |
| Ulrich (153) | Upchurch (141) | Unger (129) |
| Urban (125) | Usher (101) | Ussery (95) |
| Underhill (94) | Upshaw (89) | Uhl (86) |
| Unk (79) | Utley (75) | Ulmer (73) |
| Utter (73) | Uribe (56) | Urquhart (55) |
| Utterback (48) | Urbina (42) | Ulm (38) |
| Udell (36) | Ullman (32) | Ulloa (32) |
| Utz (32) | Updike (31) | Utsler (28) |
| Unruh (27) | Urton (27) | Uselton (25) |
| Unsworth (24) | Uber (23) | Urbanski (23) |
| Unkown (22) | Utt (22) | Upham (21) |
| Urrutia (21) | UK (20) | Umbaugh (20) |
| Ungerleider (20) | Ullom (19) | Umhack (19) |
| Urioste (19) | Ullery (18) | Ullrich (18) |
