Where does “Eidgenoss” come from?

Eidgenoss (Alemannic German) comes from German Eid, from Middle High German eit, from Old High German eid, from Proto-West Germanic aiþ, from Proto-Germanic aiþaz, from Proto-Indo-European oyt-.

Ancestry of “Eidgenoss”, step by step

Eidgenoss traces back through two separate lines of ancestry.

via German Eid

StepLanguageWordMeaning
1GermanEidoath
2Middle High Germaneit—
3Old High Germaneidoath
4Proto-West Germanicaiþoath
5Proto-Germanicaiþazoath
6Proto-Indo-Europeanoyt-—

via German Genoss

StepLanguageWordMeaning
1GermanGenossassociate

Words derived from “Eidgenoss”

Every word from Proto-Indo-European oyt- →Every word from Proto-Germanic aiþaz →Every word from Proto-West Germanic aiþ →