| Sigurd | | SEE-gurd (Swedish) | Norwegian, Danish, Swedish, Norse Mythology | |
| Siiri | | SEE:-ree (Finnish) | Estonian, Finnish | |
| Sikke | | SIK-kə | Frisian | |
| Silje | | - | Norwegian, Danish | |
| Silke | | ZIL-kə (German) | German, Dutch | |
| Sille | | SEE-le | Danish | |
| Silva | | - | Bulgarian, Slovene | |
| Silvana | | seel-VAH-nah | Italian | |
| Silvano | | seel-VAH-no | Italian | |
| Silvanus | | sil-VAY-nəs (English) | Roman Mythology, Ancient Roman, Biblical, Biblical Latin | |
| Silvester | | sil-VES-tər (English) | Dutch, English, Slovene, Slovak, German, Late Roman | |
| Silvestra | | - | Italian, Slovene | |
| Silvestre | | seel-BE-stre (Spanish) | Spanish, Portuguese | |
| Silvestro | | seel-VE-stro | Italian | |
| Silvia | | SEEL-vyah (Italian), SEEL-byah (Spanish) | Italian, Spanish, Portuguese, Romanian, Slovak, English, German, Late Roman, Roman Mythology | |