John Gills Exposition of the Bible Commentary - Genesis 36:21
And Dishon, and Ezer, and Dishan ,.... These were three others of the sons of Seir, which with the other four before mentioned made seven: these are the dukes of the Horites, the children of Seir in the land of Edom ; these were in the land of Edom before it was so called and possessed by the Edomites, and whose posterity afterwards became tributary to them. read more
Matthew Henry's Complete Commentary - Genesis 36:20-30
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, Deut. 2:12, 22. This comes in here, not only to give light to the story, but to be a standing reflection upon the Edomites for intermarrying with them, by which, it is probable, they learned their... read more