| Name | Meaning | Gender | Origin |
|---|
| Toad | Amphibian related to frogs, with a broader body and rougher skin. | Unisex | |
| Tobias | From the Hebrew Tobiah Jah is good.
| Male | Greek |
| Toby | God is Good | Male | English |
| Tom | Bartender at the Leaky Cauldron.
| Male | English |
| Tomato | | Unisex | |
| Topaz | A yellow gemstone | Female | Greek |
| Toulouse | after a kitten in the movie Aristocats | Male | |
| Tourmaline | | Unisex | Hebrew |
| Tramp | To travel on foot. A vagrant. | Unisex | |
| Triton | after Neptune's moon | Unisex | |
| Trivia | | Unisex | Hebrew |
| Trixie | she who brings happiness | Female | Latin |
| Trixie | she who brings happiness | Female | Latin |
| Trusty | | Unisex | |
| Tug | | Unisex | Hebrew |
| Tulip | | Female | Hebrew |
| Tux | | Unisex | |
| Tux | | Unisex | |
| Tweety | | Unisex | Hebrew |
| Twinkle | | Unisex | |
| Tyche | | Unisex | Hebrew |
| Typhoon | great wind | Male | Chinese |
| Uranus | The heavens | Unisex | Latin |
| Ursula | little female bear | Female | Latin |
| Vanilla | Flavouring agent from the vanilla bean | Male | |