Where does “éyno-” come from?

éyno- (Proto-Indo-European) comes from Proto-Indo-European éy, from Proto-Indo-European h₁e-.

Ancestry of “éyno-”, step by step

éyno- traces back through two separate lines of ancestry.

via Proto-Indo-European éy

StepLanguageWordMeaning
1Proto-Indo-Europeanéythe; demonstrative pronoun; this one, he
2Proto-Indo-Europeanh₁e-—

via Proto-Indo-European óy

StepLanguageWordMeaning
1Proto-Indo-Europeanóyhe, it
Every word from Proto-Indo-European h₁e- →Every word from Proto-Indo-European éy →