| Name | Meaning | Gender | Origin |
|---|
| Racer | One that races around. Speedy | Male | Word |
| Random | | Unisex | Hebrew |
| Ranger | dweller in the field A warden employed to protect a forest area. | Male | |
| Raptor | | Unisex | |
| Razzle Dazzle | | Unisex | |
| Reese | ardor | Female | Welsh |
| Rev | | Unisex | Hebrew |
| Rex | after the Rex Banner character in The Simpsons cartoons | Male | Latin |
| Richard | powerful ruler; brave one | Male | |
| Ricochet | | Unisex | |
| Rochelle | from the little rock | Female | |
| Rocket | To move swiftly and powerfully | Male | Word |
| Rocky | rest | Male | English |
| Rogue | | Male | |
| Romper | | Unisex | Hebrew |
| Rory | aka Rors | Male | Irish |
| Rosie | From Rose - The most beautiful of flowers | Female | English |
| Rowdy | A rough disorderly person. | Male | American |
| Ruckus | | Unisex | |
| Rush | red-haired | Male | English |
| Salsa | | Unisex | |
| Samba | | Unisex | |
| Schizo | | Unisex | Hebrew |
| Schmoo | | Male | Hebrew |
| Scooter | One who goes suddenly and speedily. | Male | |