| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Silja | SEEL-yah | Finnish | ||
| Simo | SEE-mo (Finnish) | Finnish, Serbian | ||
| Sini | SEE-nee | Finnish | ||
| Sinikka | SEE-neek-kah | Finnish | ||
| Sirpa | SEER-pah | Finnish | ||
| Sisko | SEES-ko | Finnish | ||
| Sisu | SEE-soo | Finnish | ||
| Sofia | zo-FEE-ah (German), so-FEE-ah (Italian), soo-FEE-ə (Portuguese), SO-fee-ah (Finnish) | Norwegian, Swedish, German, Italian, Portuguese, Catalan, Greek, Finnish, Estonian, Slovak, Romanian | ||
| Sohvi | SOH-vee | Finnish | ||
| Soile | - | Finnish | ||
| Soili | - | Finnish | ||
| Soini | SOY-nee | Finnish | ||
| Sonja | ZAWN-yah (German), SON-yah (Finnish) | German, Dutch, Swedish, Norwegian, Danish, Icelandic, Finnish, Slovene, Serbian, Croatian, Macedonia | ||
| Stiina | STEE:-nah | Finnish | ||
| Sulo | SOO-lo | Finnish |