(Can this(+) etymology be sourced?)
From Proto-Ryukyuan *mawa(ri)(si) (whence Kunigami まーすん (māsun), Okinawan まーすん (māsun), Yaeyama まーらしぃん (mārasïn)).
まーㇲ゙さまーㇲ゙ (mādzsamādz)