An Etymological Dictionary of the German Language/Annotated/Fenchel
Fenchel, masculine (Suabian and Alemannian Fenkel), from the equivalent Middle High German vënchel, vënichel, Old High German fënahhal, fënihhal, masculine, ‘fennel’; compare Anglo-Saxon finul, English fennel; formed from Latin (fœniculum, feniculum, feniclum), fenuclum; from the same source the Romance cognates French fenouil, Italian finocchio, ‘fennel,’ are derived.