| Name | Meaning | Gender | Origin |
|---|
| Regulus | | Unisex | Hebrew |
| Remus | | Male | |
| Riddle | | Male | Hebrew |
| Rita | pearl, precious | Female | English |
| Ron | Ronald | Unisex | |
| Ronan | a pledge | Male | Irish |
| Rowena | White haired
| Female | Welsh |
| Rufus | Red haired | Male | Latin |
| Scabbers | | Unisex | |
| Scrimgeour | | Unisex | |
| Seamus | supplanter | Male | Irish |
| Severus | stern | Male | Latin |
| Sir | | Unisex | Hebrew |
| Sirius | burning | Male | Latin |
| Skeeter | | Unisex | |
| Slytherin | | Unisex | Hebrew |
| Smith | blacksmith | Male | English |
| Sprout | | Unisex | Hebrew |
| Stan | after the South Park character Stan Marsh | Male | Short |
| Stanley | Lives by the stony grove
| Male | English |
| Susan | Lily Diminutive of Susannah also used as an independent name. In the apocryphal Book of Tobit Susannah courageously defended herself against wrongful accusation. White lilies grew in the Biblical city of Susa in Persia.
| Female | Hebrew |
| Ted | English, wealthy guardian | Male | English |
| Teddy | From Edward - Prosperous guardian | Unisex | |
| Terry | Latin clan name of uncertain meaning | Male | English |
| Theodore | gift of God | Male | Greek |