| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Sinclair | sin-KLER | English (Rare) | ||
| Sindri | - | Norse Mythology, Ancient Scandinavian, Icelandic | ||
| Sindy | SIN-dee | English (Rare) | ||
| Singh | - | Indian (Sikh) | ||
| Sini | SEE-nee | Finnish | ||
| SiniŠA | - | Croatian, Serbian | ||
| Sinikka | SEE-neek-kah | Finnish | ||
| Sinjin | - | English (Rare) | ||
| Sinta | SEEN-tah | Indonesian, Javanese | ||
| SiobhÁN | shi-VAWN | Irish | ||
| Siofra | SHEEF-rə | Irish | ||
| Sionann | - | Irish Mythology | ||
| Sioned | SHON-ed | Welsh | ||
| Siors | - | Welsh | ||
| Siorus | - | Welsh |