| Name | Meaning | Gender | Origin |
|---|
| Rex | after the Rex Banner character in The Simpsons cartoons | Male | Latin |
| Ringo | apple, peace be with you | Male | English |
| Robin | Famed: bright: shining Form of Robert popular since the medieval days of Robin Hood. Robinson: (English) Son of Robert Famed: bright: shining. Surname.
| Male | |
| Rocky | rest | Male | English |
| Romeo | pilgrim to Rome | Male | Italian |
| Roo | | Unisex | Hebrew |
| Rowdy | A rough disorderly person. | Male | American |
| Rumi | | Unisex | |
| Rusty | Covered in rust - a brownish red colour. | Unisex | |
| Sake | Alcoholic beverage made from rice. | Unisex | |
| Salem | Peace
| Male | Hebrew |
| Sam | to hear | Male | English |
| Sami | All hearing
| Male | English |
| Sammie | | Unisex | |
| Sammy | Hebrew, told by God | Male | English |
| Sampson | sun | Male | Hebrew |
| Samson | Bright sun
| Male | Hebrew |
| Sandy | Abbreviation of Alexander defender of man.
| Male | Scottish |
| Schnapps | Variety of strong liquor usually associated with Holland | Unisex | |
| Scooby | | Unisex | |
| Scooter | One who goes suddenly and speedily. | Male | |
| Sebastian | An august person | Male | Latin |
| Sherlock | Blond
| Male | English |
| Shorty | Of less than average size | Unisex | |
| Simba | from The Lion King | Male | Swahili |