Smith's Bible Dictionary (1863)
(abundance of people), son of David, born to him in Hebron, and distinctly specified as the sixth, and as the child of Eglah, David’s wife.
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
ITH'REAM (residue of the people), a son of David, born at Hebron. 2 Sam 3:5; 1 Chr 3:3.
Hitchcock's Bible Names (1869)
excellence of the people