| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| SiothrÚN | - | Irish | ||
| Sipho | - | Southern African, Xhosa | ||
| Siri | SEE-ree (Swedish) | Swedish, Norwegian, Danish | ||
| Sirius | SIR-ee-əs (English), SEER-ee-əs (English) | Astronomy | ||
| Sirpa | SEER-pah | Finnish | ||
| Sisel | - | Yiddish | ||
| Sisko | SEES-ko | Finnish | ||
| Sissie | SIS-ee | English | ||
| Sissy | SIS-ee | English | ||
| Sisu | SEE-soo | Finnish | ||
| Sita | - | Hinduism, Indian, Hindi, Nepali | ||
| Sithembile | - | Southern African, Zulu | ||
| Siti | - | Malay, Indonesian | ||
| Siv | SEEV | Swedish, Norwegian, Danish, Norse Mythology | ||
| Sive | SIEV | Irish |