| Name | # Entries |
|---|---|
| Uwimana | 16 |
| U Ren | 16 |
| Ukalovic | 16 |
| U' | 15 |
| Ua | 15 |
| Ujdur | 15 |
| Umlauf | 15 |
| Ul | 15 |
| Upshall | 15 |
| Ur | 15 |
| Urand | 15 |
| Undery | 15 |
| Uta | 14 |
| Uchtman | 14 |
| Upoko | 14 |
| Usai | 14 |
| Uppington | 14 |
| Us | 14 |
| Umana | 14 |
| Usback | 14 |
| Uncle | 14 |
| Urbach | 14 |
| Ureta | 13 |
| Uhlman | 13 |
| Ulcoq | 13 |
| Urbanavicius | 13 |
| Udall | 13 |
| Udell | 13 |
| Uhatafe | 13 |
| Ulstrup | 13 |
| Unnikrishnan | 13 |
| Usmar | 13 |
| Ut | 13 |
| Usmani | 13 |
| Uremovic | 13 |
| Ustick | 12 |
| Uyanik | 12 |
| Uili | 12 |
| Upstill | 12 |
| Uridge | 12 |
| Uhrhane | 12 |
| Ungermann | 12 |
| Ulberg | 12 |
| Ursem | 12 |
| Utterson | 12 |
| Ulu | 11 |
| Upu | 11 |
| Ui | 11 |
| Uk Uk | 11 |
| Ulbricht | 11 |
| Ulliana | 11 |
| Uwins | 11 |
| Upperton | 11 |
| Urzia | 11 |
| Uzunovski | 11 |
| Unlu | 11 |
| U | 11 |
| Uguz | 11 |
| Umstad | 11 |
| Uruz | 11 |
| Uri | 11 |
| Ubaldi | 11 |
| Ubank | 11 |
| Urbanowicz | 10 |
| Ucich | 10 |
| Ulker | 10 |
| Uchiyama | 10 |
| Urzi | 10 |
| Urbanczyk | 10 |
| Utton | 10 |
| Uepa | 10 |
| Ullmann | 10 |
| Uechtritz | 10 |
| Ugonotti | 10 |
| Ulusoy | 10 |