| Name | Meaning | Gender | Origin |
|---|
| Tina | River
| Female | English |
| Tinker | | Unisex | |
| Tinker | | Unisex | |
| Tinkerbell | | Unisex | |
| Tiny | Extremely small | Unisex | |
| Tobi | | Unisex | Hebrew |
| Tobias | From the Hebrew Tobiah Jah is good.
| Male | Greek |
| Toby | God is Good | Male | English |
| Todd | fox | Male | English |
| Tom | Bartender at the Leaky Cauldron.
| Male | English |
| Tootsie | A girl or young woman. | Unisex | |
| Travis | crossing | Male | |
| Trevor | Neville's toad.
| Male | Welsh |
| Trinity | Three divine persons, The Father, The Son and The Holy Spirit. | Female | Latin |
| Trinket | | Unisex | |
| Tucker | Tucker of doth
| Male | English |
| Twilight | | Unisex | |
| Twinkle | | Unisex | |
| Tybalt | | Unisex | |
| Tyler | An English surname frequently used as a first name.
| Male | English |
| Tyra | | Female | |
| Tyrone | From Owen's territory. County Tyrone in Ireland. The late actor Tyrone Power.
| Male | Irish |
| Upton | from the upper town | Male | English |
| Uriah | God is my light
| Male | Hebrew |
| Val | Latin, healthy, strong | Male | English |