| Name | Meaning | Gender | Origin |
|---|
| Rosie | From Rose - The most beautiful of flowers | Female | English |
| Rufus | Red haired | Male | Latin |
| Samson | Bright sun
| Male | Hebrew |
| Sasquatch | has extra toes and hence is a bigfoot | Unisex | |
| Sausage | Chopped meat stuffed into a prepared casing and cooked. | Unisex | |
| Scrappy | Quarrelsome. Full of fighting spirit | Male | |
| Sinbad | | Male | |
| Skye | sky, sheltering | Female | Scottish |
| Spike | A long, thick sharp-pointed piece of wood or metal | Male | American |
| Spunky | Spirited, plucky. | Male | |
| Sylvester | A cartoon cat that tried to eat the bird character Tweety. He was a black and white cat.
| Male | Latin |
| Terminator | | Male | Hebrew |
| Thumbelina | | Unisex | |
| Thunder | Sound produced from lightning | Unisex | |
| Thunder | Sound produced from lightning | Unisex | |
| Thunder | Sound produced from lightning | Unisex | |
| Tiger | A large, striped, carnivorous mammal from Asia. | Male | Animal |
| Tiger | A large, striped, carnivorous mammal from Asia. | Male | Animal |
| Tubby | | Unisex | |
| Tuffy | | Unisex | |
| Tummy | Stomach or belly. | Unisex | |
| Tyson | son of a German, son of Ty | Male | English |
| Vader | | Unisex | |
| Zoey | | Female | |