HADAD (חֲדַד).  Biblical.
    (1)  [Hebrew Hhadhadh = "sharpness," "cunning," "subtlety"]. 
    The eighth son of Ishmael (Gen xxv. 15—R.V.; 1 Chron. i. 30).  The A.V. of Gen. xxv. 15 calls him Hadar (חֲדַר) in the text, and Hadad in the margin, the Hebrew D and R being very like each other, and very liable to become interchanged, by copyists. 
    (2)  [Hebrew = Hadhadh or Hadad = "the supreme deity of the Syrians," symbolising the sun].

    1) A king of Edom.  He was the son of Bedad, and "smote Midian in the field of Moab; the name of his city was Avith" (Gen. xxxvi. 35, 36; 1 Chron. i. 46, 47).
    (2) Another king of Edom, whose city was Pau or Pai.  The same as Hadar (cf. Gen. xxxvi. 39; 1 Chron. i. 50).
    (3) An Edomite prince, who escaped from his country when Joab, at the head of the Israelite army, was engaged for six months in the cruel task of cutting off every male in Edom.  Hadad was then a little child, and was taken by his guardians to Egypt, where he was received with much kindness by Pharaoh, the king, who assigned him a mansion and an estate, gave him food, and would have been glad to have him permanently as a naturalised Egyptian.  But when Hadad, now grown to manhood, heard that David and Joab, the great foes of his race, were dead, love of country made him determine to return home, and sorrowfully bidding adieu to the king of Egypt, his benefactor, and now become also his father-in-law, he departed for Edom, and on arrivnig, became an adversary to King Solomon, moved, it would appear, mainly by the consideration that he was David's son (1 Kings xi. 14-22). (The Sunday School Teacher's Bible Manual, Hunter, 1894)