| Silvio | | SEEL-vyo (Italian), SEEL-byo (Spanish) | Italian, Spanish, Portuguese, Croatian | |
| Simba (1) | | - | Southern African, Shona | |
| Simba (2) | | - | Eastern African, Swahili | |
| Sime | | - | Macedonian | |
| Simeon | | SIM-ee-ən (English) | Biblical, Bulgarian, Serbian | |
| Simisola | | - | Western African, Yoruba | |
| Simon | | SIE-mən (English), see-MAWN (French), ZEE-mawn (German), SEE-mawn (Dutch) | English, French, Swedish, Norwegian, Danish, German, Dutch, Hungarian, Slovene, Romanian, Macedonian | |
| Simona | | - | Italian, Czech, Slovak, Romanian, Lithuanian, Slovene, Bulgarian, Macedonian | |
| Simone (1) | | see-MON (French) | French, English | |
| Simonides | | - | Ancient Greek | |
| Simonu | | - | Old Church Slavic | |
| Sindri | | - | Norse Mythology, Ancient Scandinavian, Icelandic | |
| SiniŠA | | - | Croatian, Serbian | |
| Sipho | | - | Southern African, Xhosa | |
| Sissinnguaq | | - | Native American, Greenlandic | |