Etymology
From Middle English wastel, from Old French wastel, gastel (> French gâteau), from Late Latin wastellum, from Frankish *wastil, perhaps from Proto-Germanic *wistiz (“sustenance, food”), from Proto-Indo-European *wes- (“to be”). Cognate with Middle High German wastel (“a kind of bread”). Compare Old High German wist (“food”) and Old English wist (“food”). Doublet of gateau.