Assyrian Rab-mugi, “chief physician,” “who was attached to the king (Jer. 39:3, 13), the title of one of Sennacherib’s officers sent with messages to Hezekiah and the people of Jerusalem (2 Kings 18:17-19:13; Isa. 36:12-37:13) demanding the surrender of the city. He was accompanied by a “great army;” but his mission was unsuccessful.
Rab-Mag
2 verses
Jeremiah
Jeremiah 39:3
And all the princes of the king of Babylon came in, and sat in the middle gate, even Nergalsharezer, Samgarnebo, Sarsechim, Rabsaris, Nergalsharezer, Rabmag, with all the residue of the princes of the king of Babylon.
Jeremiah 39:13
So Nebuzaradan the captain of the guard sent, and Nebushasban, Rabsaris, and Nergalsharezer, Rabmag, and all the king of Babylon's princes;
From Easton's Bible Dictionary
Matthew George Easton, 1897