| 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 |
| Tayfun | Storm, a name with Turkish and Arabic origins, meaning turbulent and powerful. |
| Tewdor | A chief of the local people. |
| Thaddaus | Courageous and Praise |
| Thaniel | God is my divine judge today. |
| Thebault | A bold and courageous leader. |
| Thelonious | Powerful Ruler of the People |
| Thies | Diminutives of Matthew |
| Thobias | God is my gracious lord. |
| Thoralf | Thors stone or thunder elf. |
| Tibold | A Bold Leader of the People |
| Tihamer | Strong and mighty, a name with Hungarian and Slavic roots, meaning robust and fearless. |
| Tipp | Courageous Race |
| Tobby | God is my gracious provider. |
| Tobe | The Lord is Good |
| Tobi | God is my gracious master. |
| Tobiasz | God is my gracious savior. |
| Tolga | Derived from Turkish, means 'victory' or 'conqueror' |
| Trajce | Slavic origin, means 'warrior' or 'bringer of victory' |
| Tugay | A warrior of the mountain. |
| Turker | Turkish origin, means 'Turk' or 'from Turkey' |
| Tychon | One who hits the target. |
| Uffe | A wolf or a descendant of a wolf. |
| Uffo | Derived from the word for a wolf. |
| Uhler | One who works as a potter or kiln. |
| Ulfer | Fierce as a Wolf |
| Ullric | Power of the Wolf |
| Unsal | Turkish origin, means 'unique' or 'one of a kind' |