| Name | Meaning | Gender | Origin |
|---|
| Rex | after the Rex Banner character in The Simpsons cartoons | Male | Latin |
| Ricky | dominant or peaceful ruler | Male | English |
| Riley | courageous | Female | Irish |
| Rocco | rest | Male | Italian |
| Rocky | rest | Male | English |
| Romeo | pilgrim to Rome | Male | Italian |
| Roscoe | From the deer forest. | Male | Norse |
| Rosie | From Rose - The most beautiful of flowers | Female | English |
| Roxie | Persian, dawn | Female | English |
| Roxy | From Roxanne - Brilliant dawn | Female | English |
| Ruby | Jewel
| Female | Latin |
| Rudy | From Rudolph - Famous wolf | Male | |
| Rufus | Red haired | Male | Latin |
| Rusty | Covered in rust - a brownish red colour. | Unisex | |
| Sadie | Princess
| Female | English |
| Sally | saviour | Female | English |
| Sam | to hear | Male | English |
| Samantha | A listener | Female | Hebrew |
| Sammy | Hebrew, told by God | Male | English |
| Samson | Bright sun
| Male | Hebrew |
| Sandy | Abbreviation of Alexander defender of man.
| Male | Scottish |
| Sarge | Noncommissioned Army or Air Force rank | Male | |
| Sasha | defending men | Female | Russian |
| Sassy | Lively and spirited | Female | |
| Scooby | | Unisex | |