An Etymological Dictionary of the German Language/Annotated/Farbe
Farbe, feminine, ‘colour, complexion, suit (of cards),’ from Middle High German varwe, Old High German farawa, ‘colour’; a fem, substantive from the Middle High German adjective var, inflected form varwer, ‘coloured,’ from Old High German faro (nominative farawêr); compare Dutch verw. The word originated probably in Middle Europe, but found its way to the North; Danish farve, Swedish färg. Is Gothic *farwa-, adjective (whence Lithuanian parwas, ‘colour’), or *fazwa to be postulated?