| Thaddeus | | THAD-ee-əs (English) | English, Biblical, Biblical Latin | |
| Thalita | | - | Portuguese (Brazilian) | |
| Thandiwe | | - | Southern African, Xhosa | |
| Thane | | THAYN | English (Rare) | |
| Thanh | | TUNG, TUN | Vietnamese | |
| Thankful | | THANGK-fəl | English (Archaic) | |
| Thea | | TE-ah (German), THEE-ə (English) | German, Swedish, Danish, Norwegian, English | |
| Thei | | - | Limburgish | |
| Thelma | | THEL-mə | English | |
| Thelonius | | - | Various | |
| Thema | | - | Western African, Akan | |
| Themba | | - | Southern African, Zulu | |
| Theo | | THEE-o (English), TAY-o (Dutch) | English, Dutch | |
| Theobald | | THEE-ə-bawld (English) | English (Rare), Ancient Germanic | |
| Theodor | | - | German, Swedish, Norwegian, Danish, Czech, Romanian | |