| Sigrun | | - | Swedish, Norwegian, Danish | |
| Sigurd | | SEE-gurd (Swedish) | Norwegian, Danish, Swedish, Norse Mythology | |
| Silje | | - | Norwegian, Danish | |
| Sille | | SEE-le | Danish | |
| Simon | | SIE-mən (English), see-MAWN (French), ZEE-mawn (German), SEE-mawn (Dutch) | English, French, Swedish, Norwegian, Danish, German, Dutch, Hungarian, Slovene, Romanian, Macedonian | |
| Siri | | SEE-ree (Swedish) | Swedish, Norwegian, Danish | |
| Siv | | SEEV | Swedish, Norwegian, Danish, Norse Mythology | |
| Sofie | | zo-FEE (German), so-FEE-e (Danish), so-FEE (Dutch) | German, Danish, Dutch, Czech | |
| Solvej | | - | Danish | |
| Sonja | | ZAWN-yah (German), SON-yah (Finnish) | German, Dutch, Swedish, Norwegian, Danish, Icelandic, Finnish, Slovene, Serbian, Croatian, Macedonia | |
| Steen | | - | Danish | |
| Stefan | | SHTE-fahn (German), STAY-fahn (Dutch), STE-fahn (Polish) | German, Swedish, Norwegian, Danish, Dutch, Polish, Bulgarian, Macedonian, Serbian | |
| Stefanie | | SHTE-fah-nee (German), STAY-fah-nee (Dutch) | German, Dutch, Danish | |
| Steffen | | SHTE-fen (Low German) | Low German, Danish, Norwegian, Dutch | |
| Sten | | - | Swedish, Danish, Norwegian, Dutch | |