Easton's Bible Dictionary (1897)
Copper, the daughter of Elnathan of Jerusalem, and the wife of Jehoiakin (2 Kings 24:8), king of Judah.
Smith's Bible Dictionary (1863)
(brass), the daughter of Elnathan of Jerusalem, wife of Jehoiakim and mother of Jehoiachin, kings of Judah.
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
NEHUSH'TA (brass), mother of Jehoiachin. 2 Kgs 24:8.
Hitchcock's Bible Names (1869)
made of brass