| Sabellius | | - | Late Roman | |
| Salvator | | - | Late Roman | |
| Salvatrix | | - | Late Roman | |
| Sanctius | | - | Late Roman | |
| Scholastica | | - | Late Roman | |
| Sebastianus | | - | Late Roman | |
| Seraphina | | - | English (Rare), German (Rare), Late Roman | |
| Seraphinus | | - | Late Roman | |
| Serena | | sə-REEN-ə (English), se-RE-nah (Italian) | English, Italian, Late Roman | |
| Servatius | | - | Late Roman | |
| Sibylla | | zi-BUY-lah (German) | Greek, German, Swedish, Late Roman, Late Greek | |
| Sidonia | | - | Late Roman, German | |
| Sidonius | | - | Late Roman | |
| 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 | |