| Theotimus | | - | Ancient Greek (Latinized) | |
| Therapon | | - | Late Greek | |
| Theron | | - | Ancient Greek | |
| Thersa | | - | Biblical Latin, Biblical Greek | |
| Theseus | | THEE-see-əs (English) | Greek Mythology | |
| Thomas | | TAHM-əs (English), TOM-əs (English), to-MAH (French), TO-mahs (German, Dutch), tho-MAHS (Greek) | English, French, German, Dutch, Swedish, Norwegian, Danish, Greek, Biblical, Biblical Latin, Biblica | |
| 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 | |