| Name | Meaning | Gender | Origin |
|---|
| Riff | | Unisex | Hebrew |
| Rix | | Unisex | Hebrew |
| Rolf | Fame, Wolf | Unisex | German |
| Ron | Ronald | Unisex | |
| Roo | | Unisex | Hebrew |
| Rouge | | Unisex | |
| Ruff | Fun spelling of rough; irregular surface or boisterous. | Unisex | |
| Saint | | Unisex | Hebrew |
| Scar | from The Lion King | Unisex | |
| Scud | | Unisex | Hebrew |
| Shaq | | Unisex | Hebrew |
| Shark | | Unisex | |
| Shine | | Unisex | Hebrew |
| Sid | | Unisex | |
| Sir | | Unisex | Hebrew |
| Skip | From Skipper, Meaning Shipmaster | Unisex | English |
| Slash | | Unisex | |
| Slim | Slender in proportion to height. | Unisex | |
| Smoke | | Unisex | |
| Smoke | | Unisex | |
| Smooch | | Unisex | |
| Sniff | A short inhale through the nose. To savour or investigate a smell. | Unisex | |
| Snoop | To pry into the private affairs of others | Unisex | |
| Socks | Short stockings finishing above the ankle | Unisex | |
| Song | | Unisex | Hebrew |