| Thancmar | | - | Ancient Germanic | |
| Thankarat | | - | Ancient Germanic | |
| Themistocles | | - | Ancient Greek (Latinized) | |
| Themistokles | | - | Ancient Greek | |
| Theobald | | THEE-ə-bawld (English) | English (Rare), Ancient Germanic | |
| Theocritus | | - | Ancient Greek (Latinized) | |
| Theoderich | | - | Ancient Germanic | |
| Theodoar | | - | Ancient Germanic | |
| Theodoard | | - | Ancient Germanic | |
| Theodora | | thee-ə-DAWR-ə (English) | English, Greek, Ancient Greek | |
| Theodoricus | | - | Ancient Germanic (Latinized) | |
| Theodoros | | - | Greek, Ancient Greek | |
| Theodorus | | - | Ancient Greek (Latinized), Dutch | |
| Theodosia | | - | Ancient Greek, Greek | |
| Theodosios | | - | Ancient Greek | |