| Trixie | | TRIK-see | English | |
| Troy | | TROI | English | |
| Trudi | | TROO-dee | German, English | |
| Trudie | | TROO-dee (English), TRUY-dee (Dutch) | English, Dutch | |
| Trudy | | TROO-dee (English), TRUY-dee (Dutch) | English, Dutch | |
| Trueman | | TROO-mən | English (Rare) | |
| Truman | | TROO-mən | English | |
| Tryggvi | | - | Icelandic, Ancient Scandinavian | |
| Tryphaina | | - | Biblical Greek, Ancient Greek | |
| Tryphon | | - | Ancient Greek | |
| Tryphosa | | - | Biblical, Biblical Greek, Ancient Greek | |
| Tucker | | TUK-ər | English (Modern) | |
| Tullia | | - | Italian, Ancient Roman | |
| Tullius | | - | Ancient Roman | |
| Tupaarnaq | | - | Native American, Greenlandic | |