Moselle (a left tributary of Rhine, flowing through the departments of Vosges, Meurthe-et-Moselle and Moselle in northeastern France, through Luxembourg, and through the states of Rhineland-Palatinate and Saarland, Germany)
From Old High German Muosela or directly from Old Dutch [Term?], from Latin Mosella. For the vocalism, compare other Franconian lects, e.g. Luxembourgish Musel.