| Sievert | Victory Protection |
| Sigfredo | Victorious Peace |
| Sigfryd | A name meaning victory and peace together. |
| Siggy | Victorious Peace |
| Sigi | Protection; Safety; Victory; Peace |
| Sigmar | Victory, a name with Germanic and Norse origins, meaning triumphant and victorious. |
| Sigo | Protection; Safety; Victory; Peace |
| Sigumari | A name meaning victory and great fame. |
| Sindbah | A name meaning lord of the Indus river. |
| Slavo | Slav, a name with Slavic and Russian roots, meaning Eastern European heritage. |
| Sonke | Wise and intelligent, a name with Japanese and Chinese origins, meaning perceptive. |
| Stadler | A German name meaning a barn builder. |
| Stadtler | A German name meaning city dweller. |
| Stasik | A Slavic name meaning one who stands firm. |
| Stearns | Derived from the word for star. |
| Stern | One who is austere or severe. |
| Stipe | Crown, a name with Slavic and Croatian roots, meaning royal and regal. |
| Stojan | To stand firm or stay steady. |
| Sait | Meaning a person who is a hunter. |
| Sakis | Derived from Greek, meaning 'wise' or 'intelligent'. |
| Sales | Derived from Latin, meaning 'of the sea' or 'relating to sales'. |
| Sanchez | Saint James, Sacred or Holy |
| Sandero | A helper or defender of mankind. |
| Sanyi | Defender of Man |
| Sardion | Carnelian Stone |
| Savvas | Derived from Greek, meaning 'summer' or 'lively'. |
| Sawney | Defender of Man |
| Sebastin | Derived from Latin, meaning 'venerable' or 'revered'. |
| Sebastine | Man from Sebasta |
| Sebestyjan | Man from Sebasta |
| Seischthon | One who shakes the earth itself. |
| Seleukos | Derived from the golden light. |
| Serafeim | Derived from Hebrew, meaning 'noble' or 'exalted'. |
| Serwacy | One who is saved or preserved. |
| Siaosi | Earthworker; Farmer |
| Sinesio | The Intelligent One |
| Sofanor | A man of wisdom and intellect. |
| Sofocles | Famous for his Wisdom |
| Sofus | Having Great Wisdom |
| Sokratis | Power through sound judgment. |