An Etymological Dictionary of the German Language/Montag

by Friedrich Kluge

Montag, m., ‘Monday’; with the môn of Mond without the later d; MidHG. mântac (Suab. and Bav. mœntac, with mutation), OHG. mânatag (*mânintag?), m., ‘Monday’; comp. Du. maandag, AS. mônandœg, E. Monday (*môn equiv. to ‘moon’), OIc. mánadagr. The common Teut. term for Lat. dies Lunae (Fr. lundi, Ital. lunedi).