| 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 | |
| Suoma | | SOO-o-mah | Finnish | |
| Susanna | | soo-ZAHN-nah (Italian), SOO-sahn-nah (Finnish), soo-ZAN-ə (English) | Italian, Swedish, Finnish, Russian, Dutch, English, Biblical, Biblical Latin, Old Church Slavic | |
| Suvi | | SOO-vee | Finnish | |