Meaning of HADAD

"powerful".
(a) Divinity worshiped by the Arameans. His name appears as a component of proper names:
Ben-hadad (although it seems that this was a title of the kings of Syria);
Hadad-ezer.

The Assyrian scribes identify Hadad with a god of their own pantheon, patron of the weather, Ramman, that is, Rimmon.

(b) King of Edom, son of Bedad (Gen. 36:35, 36; 1 Chron. 1:46, 47).
(c) Edomite of the royal family. As a child he was taken to Egypt; Pharaoh later gave him his sister-in-law in marriage. Upon David's death he returned to Edom and, moved by God, became an adversary of Solomon, causing him harm (1 Kings: 11: 14-22).

(d) Son of Ishmael (1 Chr. 1:30), called Hadar in Gen. 25:15.
(e) King of Edom and successor of Baal-hanan (1 Chr. 1:51, 52). Also called Hadar in Gen. 36:39.
(f) It seems that "Hadad" was also a title of the kings of Edom, rather than a proper name.