| Herne | Man | Irish Names |
| Hogan | Man | Irish Names |
| Ide | Woman | Irish Names |
| Innis | Unisex | Irish Names |
| Isleen | Woman | Irish Names |
| Iveagh | Unisex | Irish Names |
| Kael | Man | Irish Names |
| Kaitlin | Woman | Irish Names |
| Kaitlyn | Woman | Irish Names |
| Kane | Man | Irish Names |
| Kassidy | Unisex | Irish Names |
| Katell | Woman | Irish Names |
| Kathleen | Woman | Irish Names |
| Keagan | Unisex | Irish Names |
| Keaira | Woman | Irish Names |
| Keefe | Man | Irish Names |
| Keegan | Unisex | Irish Names |
| Keelan | Unisex | Irish Names |
| Keelin | Unisex | Irish Names |
| Keelty | Woman | Irish Names |