| Name | Meaning | Gender | Origin |
|---|
| Polly | Bitter
| Female | English |
| Portia | pig, hog or doorway | Female | Latin |
| Puck | | Male | |
| Rainy | | Unisex | |
| Rhea | stream, mother; poppy | Female | Greek |
| Rigel | Foot. Rigel is a blue star of the first magnitude that marks the hunter's left foot in the Orion constellation.
| Male | |
| Rocket | To move swiftly and powerfully | Male | Word |
| Rocky | rest | Male | English |
| Rosalind | Beautiful
| Female | Latin |
| Rover | A wanderer | Unisex | |
| Russell | Red as a fox. | Male | |
| Sagan | | Unisex | Hebrew |
| Sashi | Moonbeam | Unisex | Hindu |
| Saturn | Sixth and second largest planet away from the Sun. | Male | |
| Scott | from Scotland | Male | English |
| Scotty | From Scotland: a Gael. Diminutive of Scott.
| Female | English |
| Selena | after the goddess Selene | Female | Latinized |
| Selene | after the Greek godess of the moon | Unisex | |
| Seren | for Serendipidity | Male | Welsh |
| Siri | fair victory | Female | Norse |
| Sirius | burning | Male | Latin |
| Skat | | Unisex | Hebrew |
| Sky | The expanse of air over the Earth | Female | Nature |
| Skye | sky, sheltering | Female | Scottish |
| Skywalker | | Unisex | Hebrew |