| Name | # Entries |
|---|---|
| Underwod | 768 |
| Uebergang | 209 |
| U | 147 |
| Unicomb | 113 |
| Uliana | 103 |
| U'ren | 102 |
| Ursino | 70 |
| Unal | 60 |
| Ullrick | 57 |
| Um | 56 |
| Uzelac | 55 |
| Utz | 54 |
| Ud Din | 49 |
| Uebel | 45 |
| Ulrick | 45 |
| Ugarte | 45 |
| Un | 45 |
| Urbanski | 40 |
| Upcroft | 40 |
| Uysal | 38 |
| Unmack | 37 |
| Utber | 32 |
| Ullman | 32 |
| Ubrihien | 31 |
| Uglow | 31 |
| Uhrig | 31 |
| Ugur | 30 |
| Urbina | 28 |
| Uribe | 28 |
| Udovicic | 28 |
| Unterrheiner | 28 |
| Uong | 27 |
| Uniacke | 26 |
| Upreti | 25 |
| Ulbrich | 25 |
| Ufer | 24 |
| Uhlhorn | 24 |
| Urso | 24 |
| Upadhyaya | 24 |
| Underwoods | 23 |
| Uther | 23 |
| Uzun | 23 |
| Ubs | 22 |
| Ulloa | 22 |
| Uprety | 22 |
| Uptin | 22 |
| Urosevic | 22 |
| Urbas | 21 |
| Uyen | 21 |
| Uva | 21 |
| Ungaro | 20 |
| Unkles | 20 |
| Urane | 20 |
| Ursini | 20 |
| Uniting | 19 |
| Ulman | 19 |
| Ussia | 19 |
| Ungar | 19 |
| Ulett | 18 |
| Uppill | 18 |
| Ursich | 18 |
| Ubiparipovic | 17 |
| Uhle | 17 |
| Uildriks | 17 |
| Unknown | 17 |
| Upsall | 17 |
| Urbancic | 17 |
| Umer | 17 |
| U Ren | 16 |
| Ucar | 16 |
| Ukalovic | 16 |
| Urmston | 16 |
| Uthayakumar | 16 |
| Uwland | 16 |
| Uwimana | 16 |