1 Chronicles 1:36 - Albert Barnes' Notes on the Bible

Timna - In Genesis 36:11, Eliphaz has no son Timna; but he has a concubine of the name, who is the mother of Amalek, and conjectured to be Lotan’s sister 1 Chronicles 1:39. The best explanation is, that the writer has in his mind rather the tribes descended from Eliphaz than his actual children, and as there was a place, Timna, inhabited by his “dukes” (1 Chronicles 1:51; compare Gen. 35:40), he puts the race which lived there among his “sons.”