from
Easton's 1897 Bible Dictionary
Hadad
Adod, brave(?), the name of a Syrian god. (1.) An Edomite king
who defeated the Midianites (Gen. 36:35; 1 Chr. 1:46).
(2.) Another Edomite king (1 Chr. 1:50, 51), called also Hadar
(Gen. 36:39; 1 Chr. 1:51).
(3.) One of "the king's seed in Edom." He fled into Egypt,
where he married the sister of Pharaoh's wife (1 Kings
11:14-22). He became one of Solomon's adversaries.
Hadad, sharp, (a different name in Hebrew from the preceding),
one of the sons of Ishmael (1 Chr. 1:30). Called also Hadar
(Gen. 25:15).