| Name | Meaning | Gender | Origin |
|---|
| Thunder | Sound produced from lightning | Unisex | |
| Tiberius | of the Tiber | Male | Latin |
| Tiburon | after a freeway exit in Marin County, CA | Unisex | |
| Tidge | | Unisex | |
| Tigbit | | Unisex | |
| Tiger | A large, striped, carnivorous mammal from Asia. | Male | Animal |
| Tiger | A large, striped, carnivorous mammal from Asia. | Male | Animal |
| Tigger | from Winnie the Pooh | Unisex | |
| Tiki | Maori figure representing an ancestor. A wooden or stone image of a Polynesian god. | Unisex | |
| Tikka | | Unisex | |
| Tiko | | Unisex | Hebrew |
| Tilcho | | Unisex | |
| Tink | | Unisex | |
| Tinka | | Unisex | |
| Tinto | | Unisex | |
| Tobias | From the Hebrew Tobiah Jah is good.
| Male | Greek |
| Toby Sebastian | | Unisex | |
| Tom | Bartender at the Leaky Cauldron.
| Male | English |
| Toms | | Unisex | |
| Toonces | named for Toonces the Driving Cat of Saturday Night Live fame | Unisex | |
| Toothless | | Unisex | |
| Tootsie | A girl or young woman. | Unisex | |
| Tootsie Roll | | Unisex | |
| Topase | | Unisex | |
| Toshiro | | Unisex | |