Where does “kay” come from?

kay (Old French) comes from Gaulish kagyum, from Proto-Celtic kagyom, from Proto-Indo-European kagʰyóm, from Proto-Indo-European -yós — Creates adjectives from noun or verb stems.

Ancestry of “kay”, step by step

kay traces back through two separate lines of ancestry.

via Gaulish kagyum

StepLanguageWordMeaning
1Gaulishkagyum
2Proto-Celtickagyompen, enclosure
3Proto-Indo-Europeankagʰyómenclosure, hedge
4Proto-Indo-European-yósCreates adjectives from noun or verb stems

via Gaulish cagiíum

StepLanguageWordMeaning
1Gaulishcagiíumenclosure

Words derived from “kay

Every word from Proto-Indo-European -yósEvery word from Proto-Indo-European kagʰyómEvery word from Proto-Celtic kagyom