| Name | Meaning | Gender | Origin |
|---|
| Ryon | Kingly. | Unisex | Irish |
| Scully | Herald
| Male | Irish |
| Seamus | supplanter | Male | Irish |
| Sean | God's grace | Male | Irish |
| Shai | hebrew for gift | Male | Hebrew |
| Shamrock | | Unisex | |
| Shamus | Supplanter | Male | Anglicized |
| Shane | God is gracious | Male | Irish |
| Shaun | Irish variation of John, God is gracious | Male | Spelling |
| Shawn | God is gracious | Male | Spelling |
| Shay | gift | Male | Phonetic |
| Sheridan | The Wild Man | Male | Irish |
| Sine | God Is Gracious | Unisex | Irish |
| Suibne | Well Done | Unisex | Irish |
| Sullivan | black-eyed one | Male | Irish |
| Tate | to be cheerful; windy, a great talker | Male | English |
| Tomas | twin | Male | |
| Trevor | Neville's toad.
| Male | Welsh |
| Tyrell | Derivative of the Scandinavian god of battle Tyr. Tuesday was named for Tyr.
| Male | |
| Tyrelle | Derivative of the Scandinavian god of battle Tyr. Tuesday was named for Tyr.
| Male | |
| Tyrone | From Owen's territory. County Tyrone in Ireland. The late actor Tyrone Power.
| Male | Irish |
| Tyronne | From Owen's territory. County Tyrone in Ireland. The late actor Tyrone Power.
| Male | |
| Uaid | Irish form of Walter
| Male | |
| Ualtar | Strong fighter
| Male | |
| Ungus | One vigor
| Male | |