Hadar in Easton's Bible Dictionary
Adod, brave(?). (1.) A son of Ishmael (Gen. 25:15); in 1 Chr.
1:30 written Hadad.
(2.) One of the Edomitish kings (Gen. 36:39) about the
Saul. Called also Hadad (1 Chr. 1:50, 51).
It is probable that in these cases Hadar may be an
simply of transcription for Hadad. http://www.bible-history.com/eastons/H/Hadar/
Hadar Scripture - Genesis 36:39
And Baalhanan the son of Achbor died, and Hadar reigned in his
stead: and the name of his city [was] Pau; and his wife's name
[was] Mehetabel, the daughter of Matred, the daughter of