| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Liam | LEE-əm (English) | Irish, English | ||
| Lir | LEER | Irish Mythology | ||
| Lochlainn | - | Irish | ||
| Lochlann | - | Irish | ||
| LomÁN | - | Irish | ||
| LommÁN | - | Irish | ||
| LonÁN | - | Irish | ||
| LorcÁN | LOR-kan | Irish | ||
| LorccÁN | LOR-kan | Irish | ||
| LuÍSeach | - | Irish | ||
| Lug | - | Irish Mythology | ||
| Lugaid | - | Irish Mythology | ||
| Lugh | - | Irish Mythology | ||
| Lughaidh | LOO-ee | Irish, Irish Mythology | ||
| Luigsech | - | Ancient Irish |