| Name | Meaning | Gender | Origin |
|---|
| Prometheus | Forethought | Unisex | Greek |
| Quentin | Fifth.
| Male | Latin |
| Rex | after the Rex Banner character in The Simpsons cartoons | Male | Latin |
| Reyna | Peaceful, Queen | Unisex | Spanish |
| Rhea | stream, mother; poppy | Female | Greek |
| Rhodes | dweller by the crosses; roses | Male | Greek |
| Rufus | Red haired | Male | Latin |
| Rum Tum Tugger | | Unisex | Hebrew |
| Rumpleteazer | | Unisex | Hebrew |
| Rydia | Rose pettles on still water.
| Female | |
| Saina | Princess
| Female | |
| Sandi | Defender, helper of all men.
| Female | |
| Sandra | Helper of Mankind | Female | English |
| Sandy | Abbreviation of Alexander defender of man.
| Male | Scottish |
| Saturn | Sixth and second largest planet away from the Sun. | Male | |
| Scorpio | scorpion | Male | Latin |
| Scylla | | Unisex | Hebrew |
| Sebastian | An august person | Male | Latin |
| Selena | after the goddess Selene | Female | Latinized |
| Selene | after the Greek godess of the moon | Unisex | |
| Selina | Moon | Unisex | Greek |
| Serge | servant | Male | |
| Sibyl | seer, oracle | Female | Greek |
| Socrates | | Male | |
| Sofia | wisdom | Female | Greek |