| Name | Meaning | Gender | Origin |
|---|
| Tomahawk | | Male | |
| Tommy | From Thomas - The twin. | Male | English |
| Tootsie | A girl or young woman. | Unisex | |
| Topaz | A yellow gemstone | Female | Greek |
| Topper | Hill | Unisex | German |
| Tornado | Violently rotating funnel shaped cloud. | Female | Spanish |
| Toulouse | after a kitten in the movie Aristocats | Male | |
| Tracey | Summer, Harvester | Unisex | English |
| Traveler | | Male | Hebrew |
| Trekky | | Unisex | Hebrew |
| T-Rex | | Unisex | Hebrew |
| Tricky | | Unisex | Hebrew |
| Trigger | | Unisex | |
| Trina | German variation of Katherine | Female | Scandinavian |
| Trinity | Three divine persons, The Father, The Son and The Holy Spirit. | Female | Latin |
| Tripod | | Unisex | Hebrew |
| Tripper | Traveler | Unisex | English |
| Tris | | Unisex | Hebrew |
| Tristan | A knight
| Male | Celtic |
| Triton | after Neptune's moon | Unisex | |
| Trivia | | Unisex | Hebrew |
| Trixie | she who brings happiness | Female | Latin |
| Trixie | she who brings happiness | Female | Latin |
| Trixy | Cheerful, Brings Joy | Unisex | Latin |
| Trouble | A cause of disturbance or difficulty. | Male | |