An Etymological Dictionary of the German Language/Sahne
Sahne, f., ‘cream,’ from the equiv. late MidHG. (MidG. and LG.) sane, f.; comp. Du. zaan. The word orig. also belonged probably to UpG., as is indicated by the derivative Senne (for Sahne the UpG. and MidG. word Rahm is now used, in Swiss also nĭdel, and in other dials. Schmant). The origin of the cognates is obscure.