Where does “Ιουερνία” come from?

Ιουερνία (Greek) comes from Ancient Greek Ἰουερνία, from Primitive Irish *Īweriū, from Proto-Celtic Φīweryū, from Proto-Indo-European piHweryon-, from Proto-Indo-European peyH- — fat, milk.

Ancestry of “Ιουερνία”, step by step

StepLanguageWordMeaning
1Ancient GreekἸουερνίαIreland
2Primitive Irish*Īweriū
3Proto-CelticΦīweryū
4Proto-Indo-EuropeanpiHweryon-
5Proto-Indo-EuropeanpeyH-fat, milk
Every word from Proto-Indo-European peyH-Every word from Proto-Indo-European piHweryon-Every word from Proto-Celtic Φīweryū