Where does “chenu” come from?

chenu (French) comes from Old French chenu, from Late Latin canutus, from Latin cānus, from Proto-Italic kaznos, from Proto-Indo-European ḱas- — grayish-white; white, blond, grey; blond; grey;...

chenu (French): hoary, snow-capped; grey-haired, grey-headed;...