| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Thoma | - | Old Church Slavic | ||
| Tibor | - | Hungarian, Czech, Slovak | ||
| Tiborc | - | Hungarian | ||
| Timothei | - | Old Church Slavic | ||
| Titas | - | Lithuanian | ||
| Titu | - | Old Church Slavic | ||
| Tivadar | TEEV-aw-dawr | Hungarian | ||
| Tomas | - | Swedish, Norwegian, Lithuanian | ||
| Tomi | TO-mee (Finnish) | Finnish, Hungarian, Welsh | ||
| Tristan | TRIS-tən (English), trees-TAWN (French) | Welsh, English, French, Arthurian Romance | ||
| Tshering | - | Tibetan, Bhutanese | ||
| UgnĖ | - | Lithuanian | ||
| Urien | - | Welsh, Welsh Mythology, Arthurian Romance | ||
| UrtĖ | - | Lithuanian | ||
| Uther | - | Welsh Mythology, Arthurian Romance |