| Theudhar | | - | Ancient Germanic | |
| Theudobald | | - | Ancient Germanic | |
| Theudofrid | | - | Ancient Germanic | |
| Theudoricus | | - | Ancient Germanic (Latinized) | |
| Theutrich | | - | Ancient Germanic | |
| Thiemo | | - | German, Dutch, Ancient Germanic | |
| Thietmar | | - | Ancient Germanic | |
| Thoukydides | | - | Ancient Greek | |
| Thracius | | - | Ancient Roman | |
| Thucydides | | thoo-SID-ə-deez (English) | Ancient Greek (Latinized) | |
| Thutmose | | thoot-MO-sə (English), thoot-MOS (English) | Ancient Egyptian (Anglicized) | |
| Tiberius | | ti-BE-ri-uws | Ancient Roman | |
| Tiburtius | | - | Ancient Roman | |
| Timaeus | | tie-MEE-əs (English) | Ancient Greek (Latinized), Biblical Latin, Biblical | |
| Timaios | | - | Ancient Greek, Biblical Greek | |