Where does “irlending” come from?

irlending (Norwegian Bokmål) comes from Norwegian Bokmål Irland, from Old Norse Írland, from Old Norse Írar, from Old Irish Ériu, from Primitive Irish *Īweriū, from Proto-Celtic Φīweryū, from Proto-Indo-European piHweryon-, from Proto-Indo-European peyH- — fat, milk.

irlending (Norwegian Bokmål): person from Ireland; Irishman