| Name | Meaning | Gender | Origin |
|---|
| Rugby | rook fortress | Male | English |
| Ruger | | Unisex | |
| Runner | | Unisex | Hebrew |
| Rupert | middle name: Biggles | Male | |
| Rush | red-haired | Male | English |
| Russell | Red as a fox. | Male | |
| Rusty | Covered in rust - a brownish red colour. | Unisex | |
| Ryder | cavalryman, messenger | Male | British |
| Sabastian | Revered | Unisex | English |
| Saber | | Unisex | |
| Sachi | bliss-child; wife of Indra | Unisex | |
| Safari | | Unisex | Hebrew |
| Saint Paw | | Unisex | Hebrew |
| Sake | Alcoholic beverage made from rice. | Unisex | |
| Saladin | peace through faith | Male | Arabic |
| Salem | Peace
| Male | Hebrew |
| Salsa | | Unisex | |
| Sam | to hear | Male | English |
| Sam Cat | | Unisex | Hebrew |
| Samba | | Unisex | |
| Sambuca | Italian licquer made from elderberries and flavored with licorice. | Unisex | |
| Samson | Bright sun
| Male | Hebrew |
| Sancho | Spanish, saint, holy | Male | Spanish |
| Sandy | Abbreviation of Alexander defender of man.
| Male | Scottish |
| Sarge | Noncommissioned Army or Air Force rank | Male | |