| Ronit | Graceful | Girl | Irish |
| Rosheen | Little Rose | Girl | Irish |
| Rowan | Little red one | Unisex | Irish |
| Ruairi | Red King | Boy | Irish |
| Ruairidh | Red King | Boy | Irish |
| Ryan | Little King | Boy | Irish |
| Sabia | Sweet | Girl | Irish |
| Searlas | Manly, Masculine | Boy | Irish |
| Searlus | Manly, Masculine | Boy | Irish |
| Shaw | God is gracious | Boy | Irish |
| Shawe | God is gracious | Boy | Irish |
| Shea | Hawk like | Unisex | Irish |
| Sheridan | Searcher | Boy | Irish |
| Sinead | Kind | Girl | Irish |
| Siobhan | Kind | Girl | Irish |
| Slaine | Health | Girl | Irish |
| Sloan | Warrior | Boy | Irish |
| Sloane | Little Raider | Unisex | Irish |
| Sullivan | Little dark eyes | Boy | Irish |
| Tadg | Poet | Boy | Irish |
| Tadhg | Poet | Boy | Irish |
| Tamas | Twin. | Boy | Irish |
| Tara | Hill | Girl | Irish |
| Tearlach | Instigator, Matured | Boy | Irish |
| Toran | Victory, Castle, Watchtower | Boy | Irish |
| Torean | Victory, Castle, Watchtower | Boy | Irish |
| Toren | Victory, Castle, Watchtower | Boy | Irish |
| Torence | Victory, Castle, Watchtower | Boy | Irish |
| Torin | Victory, Castle, Watchtower | Boy | Irish |
| Torion | Victory, Castle, Watchtower | Boy | Irish |
| Torran | Victory, Castle, Watchtower | Boy | Irish |
| Torrance | Victory, Castle, Watchtower | Boy | Irish |
| Torrence | Victory, Castle, Watchtower | Boy | Irish |
| Troy | Foot Soldier | Boy | Irish |
| Tyrone | Land of Owen | Boy | Irish |
| Yseult | Fair | Girl | Irish |