| Name | Meaning | Gender | Origin |
|---|
| Rosie | Rose | Female | Latin |
| Rowdy | Boisterous. Western Nickname. | Unisex | English |
| Rush | Red | Male | French |
| Scooter | One who goes suddenly and speedily. | Unisex | English |
| Scratch | | Unisex | Hebrew |
| Shakti | Power | Female | Sanskrit |
| Sheila | Blind | Female | Latin |
| Sibyl | Female prophet | Female | Greek |
| Skipper | Master of a Ship | Male | American English |
| Skittles | | Unisex | Hebrew |
| Snap | | Unisex | Hebrew |
| Spaz | For a spazy kitty | Unisex | English |
| Spazz | | Unisex | Hebrew |
| Spencer | Someone who gives out goods | Male | French |
| Spinner | | Unisex | Hebrew |
| Sprague | High-energy | Male | French |
| Sprint | | Unisex | Hebrew |
| Suzy | Lily | Female | Hebrew |
| Taco | A folded fried tortilla filled with meat, cheese and spices. | Unisex | English |
| Tara | Crag | Female | Gaelic |
| Tatum | Tate's homestead | Female | English |
| Thad | Uncertain, perhaps praised or heart | Male | Aramaic |
| Thor | Thunder | Male | Norse |
| Tia | Princess Or Crowned One | Female | English |
| Tigger | From Winnie the Pooh | Unisex | English |
| Tod | Fox | Male | English |
| Tony | Derived From Victoria Triumphant. | Male | Latin |
| Trixie | Voyager through life | Female | Latin |
| Troy | Troyes | Female | French |
| Trumble | Strong Or Bold | Male | English |