An Assyrian prince, or, possibly, a second name given to Nergal-sharezer
And all the princes of the king of Babylon came in, and sat in the middle gate, even Nergal-sharezer, Samgar-nebo, Sarsechim, Rab-saris, Nergal-sharezer, Rab-mag, with all the residue of the princes of the king of Babylon. (Jeremiah 39:33And all the princes of the king of Babylon came in, and sat in the middle gate, even Nergal-sharezer, Samgar-nebo, Sarsechim, Rab-saris, Nergal-sharezer, Rab-mag, with all the residue of the princes of the king of Babylon. (Jeremiah 39:3))
So Nebuzar-adan the captain of the guard sent, and Nebushasban, Rab-saris, and Nergal-sharezer, Rab-mag, and all the king of Babylon's princes; (Jeremiah 39:1313So Nebuzar-adan the captain of the guard sent, and Nebushasban, Rab-saris, and Nergal-sharezer, Rab-mag, and all the king of Babylon's princes; (Jeremiah 39:13))