An Etymological Dictionary of the German Language/Fleck
Fleck, Flecken, m., n., with many senses which are historically the same, ‘spot, stain, patch,’ from MidHG. vlëc, vlëcke, m., ‘piece of stuff, patch, rag, piece of land, place, spot, differently coloured spot, stain, blemish,’ OHG. flëc, flëccho; Du. vlek, f., ‘spot of dirt,’ vlek, n., ‘village’; Goth. *flikka- or *flikkan- (or rather *þl-) is wanting; comp. OIc. flekkr (gen. plur. flekkja), m., ‘a fleck, spot, stain,’ as well as flík, f., ‘rag, piece of stuff.’ Its connection with Scand. flikke, AS. flicce, E. flitch, is dubious. See flicken.