| Silvester | | sil-VES-tər (English) | Dutch, English, Slovene, Slovak, German, Late Roman | |
| Silvia | | SEEL-vyah (Italian), SEEL-byah (Spanish) | Italian, Spanish, Portuguese, Romanian, Slovak, English, German, Late Roman, Roman Mythology | |
| Simon | | SIE-mən (English), see-MAWN (French), ZEE-mawn (German), SEE-mawn (Dutch) | English, French, Swedish, Norwegian, Danish, German, Dutch, Hungarian, Slovene, Romanian, Macedonian | |
| Siward | | - | Ancient Germanic | |
| 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 | |
| Sofie | | zo-FEE (German), so-FEE-e (Danish), so-FEE (Dutch) | German, Danish, Dutch, Czech | |
| Sonja | | ZAWN-yah (German), SON-yah (Finnish) | German, Dutch, Swedish, Norwegian, Danish, Icelandic, Finnish, Slovene, Serbian, Croatian, Macedonia | |
| Sonje | | ZAWN-yə | German | |
| Sophia | | so-FEE-ə (English), so-FIE-ə (British English), zo-FEE-ah (German) | English, Greek, German, Ancient Greek | |
| Sophie | | so-FEE (French), SO-fee (English), ZO-fee (German) | French, English, German, Dutch | |
| 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 | |
| Steffi | | - | German | |
| Steffie | | - | German (Rare) | |