| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Sari (1) | SAH-ree | Finnish | ||
| Satu | SAH-too | Finnish | ||
| Sauli | SOW-lee | Finnish | ||
| Sebastian | ze-BAHS-tee-ahn (German), sə-BAS-chən (English), se-BAHS-tyahn (Polish), SE-bahs-tee-ahn (Finnish) | German, English, Swedish, Norwegian, Danish, Polish, Finnish, Romanian | ||
| Seija | SAY-yah | Finnish | ||
| Senja | SEN-yah | Finnish | ||
| Sepi | SE-pee | Finnish | ||
| Seppo (1) | SEP-po (Finnish) | Finnish, Finnish Mythology | ||
| Seppo (2) | SEP-po | Finnish | ||
| Severi | SE-ve-ree | Finnish | ||
| Sigrid | SEEG-reed (Finnish) | Norwegian, Swedish, Danish, Estonian, Finnish (Archaic) | ||
| Siiri | SEE:-ree (Finnish) | Estonian, Finnish | ||
| Silja | SEEL-yah | Finnish | ||
| Simo | SEE-mo (Finnish) | Finnish, Serbian | ||
| Sini | SEE-nee | Finnish |