who overthrows or destroys a multitude
Hitchcock's Bible Names Dictionary
Jer_39:3; Jer_39:13. (See NERGAL SHAREZER.) Probably Magis not Magus or Magusu ("the Magi") of the Behistun inscription; the Magi had no standing in Neriglissar's time at Babylon. Emga means "priest," so Rabmag is "chief priest." The office was one of high dignity, and gave opportunities for gaining possession of the throne.
Fausset's Bible Dictionary
By Andrew Robert Fausset, co-Author of Jamieson, Fausset and Brown's 1888.
Rab-mag. Jer_39:3; Jer_39:13. A title borne by Nergal-sharezer, probably identical with the king called by the Greeks Neriglissar. [Nergal-Sharezer], (it probably means chief of the magi; at all events, it was "an office of great power and dignity at the Babylonian court, and probably gave its possessor, special facilities for gaining the throne.").
Smith's Bible Dictionary
By Dr. William Smith.Published in 1863