| Name | Meaning | Gender | Origin |
|---|
| Terminator | | Male | Hebrew |
| Tessa | Abbreviation of Teresa which is a popular saint's name of uncertain meaning.
| Female | English |
| Tessie | Abbreviation of Teresa which is a popular saint's name of uncertain meaning.
| Female | English |
| Theo | divine gift | Male | English |
| Tina | River
| Female | English |
| Tippy | | Male | |
| Tisha | Joy, Gladness | Unisex | English |
| Tizzy | | Female | Hebrew |
| Tofty | | Unisex | |
| Tom And Huck | | Male | Hebrew |
| Tomahawk | | Male | |
| Tonka | | Male | |
| Tosh | | Unisex | |
| Toulouse | after a kitten in the movie Aristocats | Male | |
| Toupee | | Unisex | Hebrew |
| Trystan | Calmitous, From an ancient Celtic prince. Variant of Tristan.
| Male | |
| Tucker | Tucker of doth
| Male | English |
| Tut | after Tutankhamun, or King Tut | Unisex | |
| Ualtar | Strong fighter
| Male | |
| Ukulele | | Unisex | |
| Uma | after the actress Uma Thurman | Female | Sanskrit |
| Unity | Together
| Female | English |
| Uno | | Unisex | |
| Uri | God is my light
| Male | Hebrew |
| Uric The Oddball | | Unisex | |