The sons of Lotan were Hori and Hemam. Timna was Lotan’s sister.
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 these are the sons of Dishon,.... Not of Dishon the son of Anah, but of Dishon the son of Seir, Gen 36:21; and they are the four following: Hemdan, and Eshban, and Ithran, and Cheran; the first of these is called Amram, or rather Chamram, Ch1 1:41.
Gen 36:20-29 (parallel, 1Ch 1:38-42). Descendants of Seir the Horite; - the inhabitants of the land, or pre-Edomitish population of the country. - “The Horite:” ὁ Τρωγλοδύτης, the dweller in caves, which abound in the mountains of Edom (vid., Rob. Pal. ii. p. 424). The Horites, who had previously been an independent people (Gen 14:6), were partly exterminated and partly subjugated by the descendants of Esau (Deu 2:12, Deu 2:22).
Commenting on Genesis 36:20-29