| Name | Meaning | Gender | Origin |
|---|
| Rat | | Unisex | |
| Redwood | | Unisex | Hebrew |
| Reef | | Male | Hebrew |
| River | | Male | |
| 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 | |
| Rock | Italian from German, rest | Male | English |
| Rowan | red-haired; rugged | Male | Scottish |
| Rue | Bitter, Medicinal Plant | Male | English |
| Rufus | Red haired | Male | Latin |
| Ryder | cavalryman, messenger | Male | British |
| Salmon | salmon, a fish | Male | Animal |
| Seal | | Male | |
| Shade | | Male | |
| Shale | | Male | |
| Silver | White
| Male | English |
| Slate | | Male | |
| Sloth | | Unisex | Hebrew |
| Smoke | | Unisex | |
| Smoke | | Unisex | |
| Snowflake | Single flake or crystal of snow. | Unisex | |
| Sorrel | reddish brown | Male | Botanical |
| Sprinkles | | Unisex | |
| Squirrel | | Unisex | |
| Steel | Strong metal alloy made of iron and carbon. Hard unflinching character. | Male | Word |
| Sterling | British money or coin. A type of silver. Of good character. genuine, valued | Male | English |