11th cent. Old Spanish muller. 12th cent. Old Spanish mugier, muger. From Latin mulier 'id.' Possibly a comparative of mollis "soft," "weak" but see de Vaan (2014) for a discussion of this argument's serious problems. If not connected to mollis, then of unknown origin. For a continued etymology of mollis, see muelle.
Asturian muyer, Portuguese mulher, Galician muller, Catalan muller, Italian moglie, Aromanian muljari, Romanian muiere, Sardinian mugere