| Traianus | | - | Ancient Roman | |
| Tristan | | TRIS-tən (English), trees-TAWN (French) | Welsh, English, French, Arthurian Romance | |
| Tudor (2) | | - | Romanian | |
| Tullia | | - | Italian, Ancient Roman | |
| Tullius | | - | Ancient Roman | |
| Ulysses | | yoo-LIS-eez (English) | Roman Mythology, English | |
| Urbanus | | - | Late Roman, Biblical Latin | |
| Urien | | - | Welsh, Welsh Mythology, Arthurian Romance | |
| Ursa | | - | Late Roman | |
| Ursinus | | - | Late Roman | |
| Ursula | | UR-sə-lə (English), UR-syə-lə (English), OOR-soo-lah (Finnish) | English, Swedish, Norwegian, Danish, German, Dutch, Finnish, Late Roman | |
| Ursus | | - | Late Roman | |
| Uther | | - | Welsh Mythology, Arthurian Romance | |
| Uthyr | | - | Welsh Mythology, Arthurian Romance | |
| Valens | | - | Ancient Roman | |