Where does “Èirinn” come from?
Èirinn (Scottish Gaelic) comes from Old Irish Érinn, from Old Irish Ériu, from Primitive Irish *Īweriū, from Proto-Celtic Φīweryū, from Proto-Indo-European piHweryon-, from Proto-Indo-European peyH- — fat, milk.
Èirinn (Scottish Gaelic): Ireland
Ancestry of “Èirinn”, step by step