From a merger of Middle High German māne (from Old High German māno, from Proto-West Germanic *mānō), and Middle High German mānōt (from Old High German mānōd, from Proto-West Germanic *mānōþ). The two words were merged throughout Central Franconian (compare Mond (“moon; month”)). The distinction between Mound and Mount in current Luxembourgish spelling mirrors German Mond versus Monat. The plural Mounden is a neologism also based on German.