|Easton's Bible Dictionary|
Jehovah his ornament, the wife of King Jehoash, and mother of King Amaziah (2 Kings 14:2).
Int. Standard Bible Encyclopedia
je-ho-ad'-an (yeho`addan, meaning unknown): In 2 Chronicles 25:1; and Qere, the King James Version in 2 Kings 14:2, where Kethibh and the Revised Version (British and American) are "Jehoaddin" (yeho`addin), the mother of King Amaziah of Judah.
Jehoaddan (2 Occurrences)
2 Kings 14:2 He was twenty and five years old when he began to reign, and reigned twenty and nine years in Jerusalem. And his mother's name was Jehoaddan of Jerusalem. (KJV JPS DBY WBS YLT)
2 Chronicles 25:1 Amaziah was twenty-five years old when he began to reign; and he reigned twenty-nine years in Jerusalem: and his mother's name was Jehoaddan, of Jerusalem. (WEB KJV JPS ASV BBE DBY WBS YLT NAS)