An Etymological Dictionary of the German Language/Ohm

by Friedrich Kluge

Ohm, m. and m., ‘awm’ (liquid measure, about 40 galls.), from MidHG. âme, ôme (â before nasals is changed into ô, comp. Mohn, Mond, Ohmet, and ohne), f., m., and n., ‘awm, measure’; corresponding to Du. aam, E. awm, Scand. áma. They are based on MidLat. ama, ‘vessel, wine measure’ (Gr. ἄχη, ‘water-pail,’ Lat. ama, ‘water bucket’). See ahmen.