| Sabia | Woman | Irish Names |
| Sadb | Woman | Irish Names |
| Sadhbh | Woman | Irish Names |
| Saeran | Man | Irish Names |
| Saoirse | Woman | Irish Names |
| Saraid | Woman | Irish Names |
| Seamus | Man | Irish Names |
| Sean | Unisex | Irish Names |
| Seana | Woman | Irish Names |
| Seath | Unisex | Irish Names |
| Senán | Man | Irish Names |
| Seoras | Man | Irish Names |
| Shamus | Man | Irish Names |
| Shane | Unisex | Irish Names |
| Shannan | Unisex | Irish Names |
| Shannon | Unisex | Irish Names |
| Shaughnessy | Unisex | Irish Names |
| Shay | Unisex | Irish Names |
| Shea | Unisex | Irish Names |
| Sheehan | Woman | Irish Names |