| Theutrich | | - | Ancient Germanic | |
| Thiemo | | - | German, Dutch, Ancient Germanic | |
| Thietmar | | - | Ancient Germanic | |
| Thoukydides | | - | Ancient Greek | |
| Thucydides | | thoo-SID-ə-deez (English) | Ancient Greek (Latinized) | |
| Timaeus | | tie-MEE-əs (English) | Ancient Greek (Latinized), Biblical Latin, Biblical | |
| Timaios | | - | Ancient Greek, Biblical Greek | |
| Timo (3) | | - | Ancient Greek | |
| Timon | | TIE-mən (English), TEE-mawn (Dutch) | Ancient Greek, Biblical, Biblical Greek, Biblical Latin, Dutch | |
| Timoteus | | - | Ancient Greek (Latinized) | |
| Timothea | | - | Ancient Greek, Greek | |
| Timotheos | | - | Ancient Greek, Biblical Greek | |
| Tryphaina | | - | Biblical Greek, Ancient Greek | |
| Tryphon | | - | Ancient Greek | |
| Tryphosa | | - | Biblical, Biblical Greek, Ancient Greek | |