| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 841 | Sloan | Gaelic | Warrior. | M | |
| 842 | Sloane | Gaelic | Warrior. | M | |
| 843 | Somerled | Gaelic | Asked of God. | M | |
| 844 | Somhairle | Gaelic | Asked of God. | M | |
| 845 | Steaphan | Gaelic | Crown; wreath. Variant of Stephen. | M | |
| 846 | Stiabhan | Gaelic | Gaelic form of Stepher. | M | |
| 847 | Tadhg | Gaelic | Poet. | M | |
| 848 | Taggart | Gaelic | Son of a prelate. | M | |
| 849 | Taidhg | Gaelic | Poet. | M | |
| 850 | Taithleach | Gaelic | Quiet. | F | |
| 851 | Taithleach | Gaelic | Quiet. | M | |
| 852 | Tara | Gaelic | From the crag of a tower. | F | |
| 853 | Teague | Gaelic | Poet. | M | |
| 854 | Tearlach | Gaelic | Manly. | M | |
| 855 | Tearley | Gaelic | Manly. | M | |
| 856 | Tearly | Gaelic | Manly. | M | |
| 857 | Teimhnean | Gaelic | Dark. | M | |
| 858 | Terrence | Gaelic | From the knolls. | M | |
| 859 | Thornton | Gaelic | Town of thorns. Thorn variants are English surnames occasionally used as given names. | M | |
| 860 | Tioboid | Gaelic | Bold. | M | |