| Simmons | Unisex | English Names |
| Simpson | Man | English Names |
| Sims | Unisex | English Names |
| Sincerely | Woman | English Names |
| Sinclair | Man | English Names |
| Singleton | Unisex | English Names |
| Sinjin | Man | English Names |
| Sir | Man | English Names |
| Sire | Man | English Names |
| Skaggs | Unisex | English Names |
| Skinner | Unisex | English Names |
| Skipper | Man | English Names |
| Slade | Man | English Names |
| Slater | Unisex | English Names |
| Smith | Man | English Names |
| Snow | Woman | English Names |
| Snowy | Unisex | English Names |
| Snyder | Man | English Names |
| Solstice | Woman | English Names |
| Sonnet | Unisex | English Names |