Where does “Ivernia” come from?

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

Ancestry of “Ivernia”, step by step

Step	Language	Word	Meaning
1	Latin	Ivernia	—
2	Ancient Greek	Ἰ̄ουερνία	Ireland
3	Primitive Irish	*Īweriū	—
4	Proto-Celtic	Φīweryū	—
5	Proto-Indo-European	piHweryon-	—
6	Proto-Indo-European	peyH-	fat, milk

Words derived from “Ivernia”

Ivernian

Every word from Proto-Indo-European peyH- →Every word from Proto-Indo-European piHweryon- →Every word from Proto-Celtic Φīweryū →