| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 821 | Sheridan | Gaelic | Bright. | M | |
| 822 | Sholto | Gaelic | Teal duck. | M | |
| 823 | Shon | Gaelic | Feminine form of John: God is gracious. | F | |
| 824 | SIaibhin | Gaelic | Mountain. | M | |
| 825 | Sighle | Gaelic | Gaelic form of Sheila. | F | |
| 826 | Sile | Gaelic | Gaelic form of Sheila. | F | |
| 827 | Silis | Gaelic | Gaelic form of Sheila. | F | |
| 828 | Sim | Gaelic | Heard. | M | |
| 829 | Sine | Gaelic | Feminine form of Sean. | F | |
| 830 | Siolat | Gaelic | Teal duck. | M | |
| 831 | SIuaghan | Gaelic | Warrior. | M | |
| 832 | Siubhan | Gaelic | Gaelic form ofJoan. | F | |
| 833 | Siusan | Gaelic | Lily. | F | |
| 834 | Skelley | Gaelic | Storyteller. | M | |
| 835 | Skelly | Gaelic | Storyteller. | M | |
| 836 | Slaven | Gaelic | Mountain. | M | |
| 837 | Slavin | Gaelic | Mountain. | M | |
| 838 | Sleven | Gaelic | Mountain. | M | |
| 839 | Slevin | Gaelic | Mountain. | M | |
| 840 | Slevyn | Gaelic | Mountain. | M | |