| Name | Meaning | Gender | Origin |
|---|
| Thomas | Twin
| Male | Aramaic |
| Thor | Viking mythology: the ruler of the weather | Male | Norse |
| Thumbs | | Unisex | Hebrew |
| Thumper | To walk with heavy steps | Unisex | |
| Tibbs | | Unisex | Hebrew |
| Tig | | Unisex | |
| Tiger | A large, striped, carnivorous mammal from Asia. | Male | Animal |
| Tiger | A large, striped, carnivorous mammal from Asia. | Male | Animal |
| Tiger Lily | | Unisex | |
| Tigger | from Winnie the Pooh | Unisex | |
| Tiggy | | Unisex | |
| Timber | Wood used as a building material. Also timber-wolf. | Male | Nature |
| Timmy | From Timothy - Honoring God | Unisex | |
| Tinkerbell | | Unisex | |
| Tippy | | Male | |
| Tipsy | | Unisex | |
| Tisha | Joy, Gladness | Unisex | English |
| Tito | Latin, meaning unknown | Male | Spanish |
| Titter | | Unisex | Hebrew |
| Titus | of the giants | Male | Latin |
| Toad | Amphibian related to frogs, with a broader body and rougher skin. | Unisex | |
| Toby | God is Good | Male | English |
| Tom | Bartender at the Leaky Cauldron.
| Male | English |
| Tom Cat | | Unisex | |
| Tom Kitten | | Unisex | Hebrew |