|Easton's Bible Dictionary|
(1.) The son of Tou, king of Hamath, sent by his father to congratulate David on his victory over Hadarezer, king of Syria (1 Chronicles 18:10; called Joram 2 Samuel 8:10).
(2.) The fifth son of Joktan, the founder of an Arab tribe (Genesis 10:27; 1 Chronicles 1:21).
(3.) One who was "over the tribute;" i.e., "over the levy." He was stoned by the Israelites after they had revolted from Rehoboam (2 Chronicles 10:18). Called also Adoram (2 Samuel 20:24) and Adoniram (1 Kings 4:6).
Int. Standard Bible Encyclopedia
(1) Son of Joktan and apparently 6th in descent from Noah (Genesis 10:27 parallel 1 Chronicles 1:21).
(2) Son of Tou, king of Hamath, sent by his father with presents to King David (1 Chronicles 18:10). In 2 Samuel 8:9, 10, written probably incorrectly "Joram," "son of Toi."
(3) Rehoboam's superintendent of the forced labor department (2 Chronicles 10:18), called Adoram 1 Kings 12:18, a contraction of ADONIRAM (which see). He was sent by Rehoboam as messenger to Israel at the time of the revolt of the ten tribes and was stoned to death by them.
George Rice Hovey
Hadoram (5 Occurrences)
Genesis 10:27 Hadoram, Uzal, Diklah, (WEB KJV JPS ASV BBE DBY WBS YLT NAS NIV)
2 Samuel 8:10 He sent his son Hadoram to David, with words of peace and blessing, because he had overcome Hadadezer in the fight, for Hadadezer had wars with Tou; and Hadoram took with him vessels of silver and gold and brass: (BBE)
1 Chronicles 1:21 and Hadoram, and Uzal, and Diklah, (WEB KJV JPS ASV BBE DBY WBS YLT NAS NIV)
1 Chronicles 18:10 he sent Hadoram his son to king David, to Greet him, and to bless him, because he had fought against Hadadezer and struck him; (for Hadadezer had wars with Tou;) and he had with him all manner of vessels of gold and silver and brass. (WEB KJV JPS ASV BBE DBY WBS YLT NAS NIV)
2 Chronicles 10:18 Then king Rehoboam sent Hadoram, who was over the men subject to forced labor; and the children of Israel stoned him to death with stones. King Rehoboam made speed to get him up to his chariot, to flee to Jerusalem. (WEB KJV JPS ASV DBY WBS YLT NAS)