An Etymological Dictionary of the German Language/Annotated/Suppe
Suppe, feminine, ‘soup, broth’; late Middle High German suppe (soppe), feminine, ‘broth, sauce, soup’; properly a Middle German and Low German word, the pp of which would be represented by pf in genuine High German. Allied to the root sū̆p, ‘to drink’; compare Middle High German supfen, ‘to sip, drink’ (Dutch soppen, English to sop) and saufen. Compare Dutch sop and soep. The Low German word passed into Romance; compare Italian zuppa, ‘wine soup,’ Spanish sopa, French soupe, whence the equivalent English soup (Old French souppe, ‘sop’).