Where does “fey” come from?

fey (Old French) comes from Latin fides, from Latin fido, from Proto-Italic feiðō, from Proto-Indo-European bʰéydʰeti, from Proto-Indo-European bʰeydʰ- — to compel, force; to trust.

Ancestry of “fey”, step by step

StepLanguageWordMeaning
1Latinfidesfaith, belief; reliance; confidence, trust
2LatinfidoI trust, put confidence in; I rely upon; dative...
3Proto-Italicfeiðōto trust
4Proto-Indo-Europeanbʰéydʰetito trust
5Proto-Indo-Europeanbʰeydʰ-to compel, force; to trust

Words derived from “fey”

Every word from Proto-Indo-European bʰeydʰ- →Every word from Proto-Indo-European bʰéydʰeti →Every word from Proto-Italic feiðō →