An Etymological Dictionary of the German Language/Schnupfen
Schnupfen, m., ‘cold (in the head), rheum,’ from the equiv. MidHG. snū̆pfe, m. and f. The Teut. root snū̆pp contained in these words, with which Schnuppe and OIc. snoppa, f., ‘snout,’ are connected, is identical with the Teut. root snuf (snū̆b) in schnauben and schnüffeln. It may be also allied to the Aryan roots snū̆p and snū̆t (in schneuzen).