| Name | Meaning | Gender | Origin |
|---|
| Pussy | | Unisex | |
| Rascal | One that is playfully mischievous | Male | |
| Rebel | One that resists of defies authority | Male | Word |
| Rex | after the Rex Banner character in The Simpsons cartoons | Male | Latin |
| Rocky | rest | Male | English |
| Romeo | pilgrim to Rome | Male | Italian |
| Rudy | From Rudolph - Famous wolf | Male | |
| Rusty | Covered in rust - a brownish red colour. | Unisex | |
| Salem | Peace
| Male | Hebrew |
| Sam | to hear | Male | English |
| Samatha | God Has Heard | Unisex | English |
| Sammy | Hebrew, told by God | Male | English |
| Samson | Bright sun
| Male | Hebrew |
| Sandstorm | | Unisex | |
| Scamp | A mischievous youngster | Male | |
| Scaredy | | Unisex | Hebrew |
| Scooter | One who goes suddenly and speedily. | Male | |
| Scout | One dispatched from main body to gather information | Male | Word |
| Sebastian | An august person | Male | Latin |
| Simba | from The Lion King | Male | Swahili |
| Simba | lion | Male | Swahili |
| Simon | he who hears | Male | Hebrew |
| Sir Lionel | | Unisex | |
| Smokey | A grayish blue colour. Slang for highway patrol officer | Male | |
| Smokey | A grayish blue colour. Slang for highway patrol officer | Male | |