Where does “Ἰ̄έρνη” come from?

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

Ancestry of “Ἰ̄έρνη”, step by step

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