Name
- Seissylt Bryffwrch1
- Shute, Reverend1
- Siams Davyddd1
- Siams ab Harri1
- Siancyn Morgan1
- Siancyn ab Einion1
- Siballs, Reverend1
- Silvester, Joshua1
- Sion Caerau Hên1
- Sion Cain1
- Sion Clywedog1
- Sion Lewis1
- Sion Meirion1
- Sion Morgan1
- Sion Owain, Syr1
- Sion Salbri1
- Sion Teg, Syr1
- Sion Tomas Owain1
- Sion ab Meredydd ab Hywel1
- Sion ab Rhisiart Piers1