| Theobald | | THEE-ə-bawld (English) | English (Rare), Ancient Germanic | |
| Theodor | | - | German, Swedish, Norwegian, Danish, Czech, Romanian | |
| Theodora | | thee-ə-DAWR-ə (English) | English, Greek, Ancient Greek | |
| Theodore | | THEE-ə-dawr | English | |
| Theodoric | | thee-AHD-ə-rik (English) | History | |
| Theresa | | tə-REE-sə (English), tə-RAY-zə (English), te-RE-zah (German) | English, German, Swedish, Norwegian, Danish | |
| Therese | | te-RE-zə (German), te-RES (Swedish), tə-REES (English) | German, Swedish, Norwegian, Danish, English | |
| Theresia | | tə-RAY-see-ah (Dutch) | German, Dutch, Swedish | |
| Thi | | - | Vietnamese | |
| Thiago | | - | Portuguese (Brazilian) | |
| Thoko | | TO-ko | Southern African, Chewa | |
| Thokozani | | to-ko-ZAH-nee | Southern African, Chewa | |
| Thom | | TAHM | English | |
| Thoma | | - | Old Church Slavic | |
| 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 | |