| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Thane | THAYN | English (Rare) | ||
| Thecla | - | Dutch (Rare), Late Greek (Latinized) | ||
| Thekla | - | German (Rare), Greek (Rare), Late Greek | ||
| Theobald | THEE-ə-bawld (English) | English (Rare), Ancient Germanic | ||
| Theofilus | - | Dutch (Rare) | ||
| Thorburn | THAWR-bərn | English (Rare) | ||
| Thorley | THAWR-lee | English (Rare) | ||
| Thurstan | THUR-stən | English (Rare) | ||
| Tierney | TEER-nee | Irish, English (Rare) | ||
| Tiffiny | TIF-ə-nee | English (Rare) | ||
| Tiger | TIE-gər | English (Rare) | ||
| Tikhon | TEE-khahn | Russian (Rare) | ||
| Tillo | - | German (Rare) | ||
| Timotha | TIM-ə-thə | English (Rare) | ||
| Topaz | TO-paz | English (Rare) |