| Surname | Country | State | County or Province | From | To | Member |
|---|---|---|---|---|---|---|
| Uding | Netherlands | 1912 | M024-1 | |||
| Udvary | A010-1 | |||||
| Uga | France | Provence-Alpes-Côte-d'Azur | Alpes-Maritimes | 1600 | 1700 | J009-1 |
| Uhler | Poland | Pommerania, Polochowo | 1815 | 1901 | T004-1 | |
| Ulandowski | Germany | D016-1 | ||||
| Ulandowski | USA | Indiana | D016-1 | |||
| Ulandowski | USA | Illinois | D016-1 | |||
| Ullman | Germany | Pommern | S035-1 | |||
| Ullman | USA | Wisconsin | Kewaunee County | S035-1 | ||
| Ullmann | USA | Wisconsin | Kewaunee | S035-1 | ||
| Ullmann | USA | Illinois | Cook | S035-1 | ||
| Urbrock | Prussia | E005-1 | ||||
| Urbrock | Denmark | E005-1 | ||||
| Urbrock | USA | Michigan | E005-1 |