köken: From Middle High German melk, from Old High German melch, from Proto-West Germanic *melk, from Proto-Germanic *melkaz, ultimately from the root of Milch. Compare Old English þrimilce.
From Proto-Brythonic *bliθ, a conflation of a noun Proto-Celtic *mlixtus and an adjective *mlixtis, from Proto-Indo-European *h₂melǵ- (compare English milk, Latin mulgeō (“to milk”)). Cognate with Irish bleacht.