| Name | Meaning | Gender | Origin |
|---|
| Stewart Ackerly | Ravenclaw student.
| Male | |
| Sweetie | Sweetheart. | Male | |
| Sylvester | A cartoon cat that tried to eat the bird character Tweety. He was a black and white cat.
| Male | Latin |
| Tab | Abbreviation of Tabor. The biblical Mt. Tabor is a landmark mountain near Nazareth.
| Male | Modern |
| Tadeo | Praise
| Male | Spanish |
| Tang | | Unisex | |
| Tariq | Morning star. An 8th century Islamic military leader who conquered Spain for the Moors.
| Male | Arabic |
| Tarka | | Male | |
| Tater | | Male | |
| Tavio | Abbreviation of Octavio eighth.
| Male | |
| Terence Higgs | Slytherin seeker.
| Male | |
| Terminator | | Male | Hebrew |
| Timber | Wood used as a building material. Also timber-wolf. | Male | Nature |
| Toffee | A hard brown, chewy candy | Male | |
| Tom | Bartender at the Leaky Cauldron.
| Male | English |
| Tomcat | | Male | Hebrew |
| Tonto | | Male | |
| Topcat | | Male | |
| Tortie | | Male | |
| Tuffy | | Unisex | |
| Turks | | Male | Hebrew |
| Tweety | | Unisex | Hebrew |
| Tyrone | From Owen's territory. County Tyrone in Ireland. The late actor Tyrone Power.
| Male | Irish |
| Ubel | Evil
| Male | |
| Ungus | One vigor
| Male | |