- Uddin 36
- Udell 37
- Ugalde 9
- Ugarte 14
- Uhl 150
- Uhler 42
- Ulibarri 20
- Ullman 78
- Ulloa 83
- Ullrich 92
- Ulrich 575
- Umana 34
- Umanzor 12
- Umberger 37
- Umstead 19
- Underhill 148
- Underwood 1646
- Unger 533
- Unruh 202
- Upchurch 214
- Updike 51
- Upham 33
- Upshaw 84
- Upson 21
- Upton 343
- Urban 685
- Urbanek 35
- Urbano 25
- Urbanski 97
- Urbina 56
- Urena 54
- Uriarte 15
- Urias 37
- Uribe 139
- Urich 22
- Uriostegui 5
- Urquhart 93
- Urrea 10
- Urrutia 45
- Urso 50
- Usher 146
- Usry 13
- Ussery 90
- Utley 140
- Utterback 52
Lasnames By U