Meshach in the Bible Encyclopedia - ISBE
me'-shak (meshakh): Possibly the Sumerian form of the
Babylonian Cil-Asharidu, "the shadow of the prince," just as
Shadrach probably means "the servant of Sin," and Abednego the
"servant of Ishtar." Meshach was one of the three Hebrew
companions of Daniel, whose history is given in the first
chapters of the Book of Daniel.
See, further, under SHADRACH.