Dishon, Ezer, and Dishan. They are the chiefs of the Horites, according to their divisions in the land of Seir.
In the midst of this genealogy of the Edomites here is inserted the genealogy of the Horites, those Canaanites, or Hittites (compare Gen 26:34), that were the natives of Mount Seir. Mention is made of them, Gen 14:6, and of their interest in Mount Seir, before the Edomites took possession of it, Deu 2:12, Deu 2:22.
Commenting on Genesis 36:20-30
And Husham died,.... As is thought, about A. M. 2219, above forty years after the death of Abraham, as computed by the above writer: and Hadad the son of Bedad (who smote Midian in the field of Moab) reigned in his stead: who he or his father were we have no other account, nor of this warlike action of his; probably the Midianites came out...
Gen 36:30 “These are the princes of the Horites according to their princes,” i.e., as their princes were individually named in the land of Seir. ל in enumerations indicates the relation of the individual to the whole, and of the whole to the individual.