| 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. |
| Tabi | A person who is a traveler. |
| Tabo | Staff of the Goths |
| Tancredi | Advice; Counsel |
| Tayfun | Storm, a name with Turkish and Arabic origins, meaning turbulent and powerful. |
| Tayyar | Current; Wind; Title of Jafar |
| Tedor | Gift from God; Divine Gift |
| Teobald | A bold and daring people ruler. |
| Teobaldo | Courageous People; Pearl |
| Terryll | Following Thor; The God of Thunder |
| Tewdor | A chief of the local people. |
| Thaddaeus | Praise, Given, Desired |
| Thaddaus | Courageous and Praise |
| Thaniel | God is my divine judge today. |
| Thebault | A bold and courageous leader. |
| Thedric | A ruler of all the people. |
| Thedrick | A powerful ruler of people. |
| Thelonious | Powerful Ruler of the People |
| Theophilos | Friend of God; Loved by God |
| Thiemo | Great, People, Race, Famous |
| Thies | Diminutives of Matthew |
| Thobias | God is my gracious lord. |
| Thoralf | Thors stone or thunder elf. |
| Thorbjorn | A bear belonging to Thor. |
| Thore | Thunder God; Thunder |
| Tibold | A Bold Leader of the People |
| Tihamer | Strong and mighty, a name with Hungarian and Slavic roots, meaning robust and fearless. |