| Silvius | Man | Latin Names |
| Sima | Woman | Hebrew Names |
| Simba | Man | African - Kiswahili Names |
| Simbala | Woman | Indian Names |
| Simcha | Unisex | Hebrew Names |
| Simeon | Man | Greek Names |
| Simeona | Woman | Greek Names |
| Simge | Woman | Turkish Names |
| Simin | Woman | Persian Names |
| Simini | Woman | African - Susu of Sierra Leone Names |
| Simmons | Unisex | English Names |
| Simon | Man | Hebrew Names |
| Simona | Woman | Spanish Names |
| Simone | Woman | French Names |
| Simpson | Man | English Names |
| Simra | Woman | Indian Names |
| Sims | Unisex | English Names |
| Sina | Man | Arabic Names |
| Sinan | Man | Arabic Names |
| Sinasta | Unisex | Native American - Cherokee Names |