Where does “koufen” come from?

koufen (Middle High German) comes from Old High German koufen, from Proto-Germanic *kaupijan.

Ancestry of “koufen”, step by step

StepLanguageWordMeaning
1Old High Germankoufento buy
2Proto-Germanic*kaupijan—

Words derived from “koufen”

Every word from Proto-Germanic *kaupijan →Every word from Old High German koufen →
koufen — Etymology, Origin & Word History | Etymology Explorer