| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Thalia | - | Greek Mythology (Latinized) | ||
| Thamar | - | Biblical Greek, Biblical Latin | ||
| Thanasis | - | Greek | ||
| Thanatos | - | Greek Mythology | ||
| Thanos | - | Greek | ||
| Thecla | - | Dutch (Rare), Late Greek (Latinized) | ||
| Theia | - | Greek Mythology | ||
| Thekla | - | German (Rare), Greek (Rare), Late Greek | ||
| Themis | - | Greek Mythology | ||
| Themistocles | - | Ancient Greek (Latinized) | ||
| Themistokles | - | Ancient Greek | ||
| Themistoklis | - | Greek | ||
| Theocritus | - | Ancient Greek (Latinized) | ||
| Theodora | thee-ə-DAWR-ə (English) | English, Greek, Ancient Greek | ||
| Theodoros | - | Greek, Ancient Greek |