Do you know ghouls from goblins and ghosts?
from French Moscovie, from Modern Latin Moscovia, old name of Russia, from Russian Moskova "(Principality of) Moscow." In Muscovy duck (1650s) and certain other uses it is a corruption of musk. Related: Muscovite.
medieval principality that, under the leadership of a branch of the Rurik dynasty, was transformed from a small settlement in the Rostov-Suzdal principality into the dominant political unit in northeastern Russia