| Name | Meaning | Gender | Origin |
|---|
| Theo | divine gift | Male | English |
| Theodore | gift of God | Male | Greek |
| Thomas | Twin
| Male | Aramaic |
| Thomas | Twin
| Male | Aramaic |
| Thor | Viking mythology: the ruler of the weather | Male | Norse |
| Thorne | thorn tree | Male | English |
| Thurston | Thor's jewel. | Male | Scandinavian |
| Tiberius | of the Tiber | Male | Latin |
| 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 | |
| Timon | worthy | Male | Greek |
| Timothy | honoring God | Male | Greek |
| Titus | of the giants | Male | Latin |
| Tobias | From the Hebrew Tobiah Jah is good.
| Male | Greek |
| Toby | God is Good | Male | English |
| Todd | fox | Male | English |
| Toffy | | Unisex | Hebrew |
| Tolstoy | | Male | |
| Tom | Bartender at the Leaky Cauldron.
| Male | English |
| Tommy | From Thomas - The twin. | Male | English |
| Toonces | named for Toonces the Driving Cat of Saturday Night Live fame | Unisex | |
| Travis | crossing | Male | |
| Trekky | | Unisex | Hebrew |
| Trent | the flooder | Male | English |