| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Steaphan | - | Scottish | ||
| Steenie | - | Scottish | ||
| Stewart | STOO-ərt, STYOO-ərt | English, Scottish | ||
| Stuart | STOO-ərt, STYOO-ərt | English, Scottish | ||
| Suibhne | SIV-na (Irish, Scottish) | Irish, Scottish, Ancient Irish | ||
| Sweeney | - | Irish, Scottish | ||
| TÀMhas | - | Scottish | ||
| TÒMas | - | Scottish | ||
| Tadg | - | Irish, Scottish | ||
| Tadhg | TIEG | Irish, Scottish | ||
| Tam (1) | - | Scottish | ||
| Tasgall | - | Scottish | ||
| Taskill | - | Scottish | ||
| Tavish | - | Scottish | ||
| TeÀRlach | - | Scottish |