dummkopf
‘a person regarded as stupid’
Lexical development traced from the Tamil root:
E. dumbkopf, dumkopf < G. dummkopf ‘dumb head’ < dumb + O.E. cuppe < O.Nort. copp < La.Lat. cuppa ‘cup’ < Lat. cupa ‘tub, cask, tun, barrel’ < kuf < kup- < Tamil kappu