John Gills Exposition of the Bible Commentary - Genesis 36:20
These are the sons of Seir the Horite, who inhabited the land ,.... "Before", as the Targum of Jonathan adds, that is, before it was inhabited by Esau and his posterity, and called Edom, and had from him the name of Seir; but the Horites dwelt here before him, even in Abraham's time, Genesis 14:6 ; and who were so called from their dwelling under ground in holes and caves, with which the further part of the land of Edom abounded, and are the same the Greeks call Trogloditae: Jarchi says,... 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