| Name | Meaning | Gender | Origin |
|---|
| Snoopy | | Unisex | Hebrew |
| Socks | Short stockings finishing above the ankle | Unisex | English |
| Sooty | Covered with soot | Unisex | English |
| Sparky | Animated, lively. | Unisex | English |
| Spirit | Part of the human being associated with the mind. Vigorous or animated state - spirited. Also distilled alcohol. | Unisex | English |
| Spot | After Data's cat on Star Trek: The Next Generation | Unisex | English |
| Spud | Slang for potato. | Unisex | English |
| Stormy | Violent weather | Unisex | English |
| Stubby | | Unisex | Hebrew |
| Suzie | Lily | Unisex | Hebrew |
| Tex | Of Texas | Unisex | English |
| Tiger | Tiger | Unisex | English |
| Tigger | From Winnie the Pooh | Unisex | English |
| Tilly | Powerful battler | Unisex | Germanic |
| Tiny | Extremely small | Unisex | English |
| Toby | God is good | Unisex | Hebrew |
| Turbo | Driven by a turbine - turbocharged | Unisex | English |
| Whiskey | An alcoholic liquor distilled from grain | Unisex | English |
| Whisky | | Unisex | Hebrew |