|Easton's Bible Dictionary|
Adod, brave (?).
(1.) A son of Ishmael (Genesis 25:15); in 1 Chronicles 1:30 written Hadad.
(2.) One of the Edomitish kings (Genesis 36:39) about the time of Saul. Called also Hadad (1 Chronicles 1:50, 51).
It is probable that in these cases Hadar may be an error simply of transcription for Hadad.
Int. Standard Bible Encyclopedia
ha'-dar (Genesis 36:39).
See HADAD (3).
Hadar (2 Occurrences)
Genesis 25:15 Hadar, and Tema, Jetur, Naphish, and Kedemah: (KJV WBS YLT)
Genesis 36:39 Baal Hanan the son of Achbor died, and Hadar reigned in his place. The name of his city was Pau. His wife's name was Mehetabel, the daughter of Matred, the daughter of Mezahab. (WEB KJV JPS ASV BBE DBY WBS YLT NAS RSV)