| Tabea | | tah-BE-ah | German | |
| Tanja | | TAHN-yah (German, Finnish) | German, Finnish, Serbian, Croatian, Slovene, Macedonian, Danish, Swedish, Norwegian | |
| Tatjana | | TAHT-yah-nah (Finnish) | Serbian, Croatian, Slovene, Macedonian, German, Latvian, Lithuanian, Finnish | |
| Teresa | | te-RE-sah (Spanish, Polish), te-RE-zah (Italian, German), TE-re-sah (Finnish), tə-REE-sə (English), tə-REE-zə (English) | Spanish, Portuguese, Italian, Finnish, Polish, German, Swedish, Norwegian, Danish, English | |
| Thancmar | | - | Ancient Germanic | |
| Thankarat | | - | Ancient Germanic | |
| Thea | | TE-ah (German), THEE-ə (English) | German, Swedish, Danish, Norwegian, English | |
| Theda | | - | German | |
| Thekla | | - | German (Rare), Greek (Rare), Late Greek | |
| Theobald | | THEE-ə-bawld (English) | English (Rare), Ancient Germanic | |
| Theoderich | | - | Ancient Germanic | |
| Theodoar | | - | Ancient Germanic | |
| Theodoard | | - | Ancient Germanic | |
| Theodor | | - | German, Swedish, Norwegian, Danish, Czech, Romanian | |
| Theodoricus | | - | Ancient Germanic (Latinized) | |