| Name | Meaning | Gender | Origin |
|---|
| Sparky | Animated, lively. | Unisex | English |
| Speedy | Rapid motion, swift. | Unisex | English |
| Spike | A long, thick sharp-pointed piece of wood or metal | Male | English |
| Spot | After Data's cat on Star Trek: The Next Generation | Unisex | English |
| Sprite | Lemonade flavored soft drink. | Unisex | English |
| Spud | Slang for potato. | Unisex | English |
| Spunky | Spirited, plucky. | Unisex | English |
| Stormy | Violent weather | Unisex | English |
| Sylvester | A forest | Male | Latin |
| Tango | | Unisex | Hebrew |
| Tank | A large metal container. A heavily armed combat vehicle | Unisex | English |
| Tarzan | White skin | Unisex | Literary |
| Taz | Wild Animal, Thrid Born | Unisex | American |
| T-bone | A thick steak containing a T shaped bone. | Unisex | English |
| Thor | Thunder | Male | Norse |
| Thumper | To walk with heavy steps | Unisex | English |
| Thunder | Stormy Tempered | Unisex | English |
| Tiger | Tiger | Unisex | English |
| Tigger | From Winnie the Pooh | Unisex | English |
| Tito | Giant | Unisex | Latin |
| Toffee | A hard brown, chewy candy | Unisex | English |
| Tom | Twin | Male | Aramaic |
| Tommy | Twin | Male | Aramaic |
| Trooper | A state or mounted police officer. Also a member of a cavalry unit. | Unisex | English |
| Tuffy | | Unisex | Hebrew |
| Turbo | Driven by a turbine - turbocharged | Unisex | English |
| Tyson | Son of Dye | Male | English |
| Ulysses | Walker | Male | Greek |
| Vinnie | Conquering | Male | Latin |
| Vlad | Rule | Male | Russian |