| Thea | | TE-ah (German), THEE-ə (English) | German, Swedish, Danish, Norwegian, English | |
| Thelma | | THEL-mə | English | |
| Theo | | THEE-o (English), TAY-o (Dutch) | English, Dutch | |
| Theobald | | THEE-ə-bawld (English) | English (Rare), Ancient Germanic | |
| Theodora | | thee-ə-DAWR-ə (English) | English, Greek, Ancient Greek | |
| Theodore | | THEE-ə-dawr | English | |
| 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 | |
| Thom | | TAHM | English | |
| 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 | |
| Thomasina | | tom-ə-SEE-nə | English | |
| Thorburn | | THAWR-bərn | English (Rare) | |
| Thorley | | THAWR-lee | English (Rare) | |
| Thornton | | THAWRN-tən | English | |
| Thurstan | | THUR-stən | English (Rare) | |