Where does “coref” come from?

coref (Middle Cornish) comes from Old Cornish coruf, from Proto-Brythonic *kurβ̃, from Proto-Celtic kurmi — beer.

Ancestry of “coref”, step by step

StepLanguageWordMeaning
1Old Cornishcoruf—
2Proto-Brythonic*kurβ̃—
3Proto-Celtickurmibeer

Words derived from “coref”

Every word from Proto-Celtic kurmi →Every word from Proto-Brythonic *kurβ̃ →Every word from Old Cornish coruf →