John Gill Commentary Genesis 36:9

"And these are the generations of Esau the father of the Edomites in mount Seir:" — Genesis 36:9 (ASV)

And these are the generations of Esau Or the posterity of Esau, his children and grandchildren, as before and hereafter related: the father of the Edomites in Mount Seir; from whom they of that mountain and in the adjacent country had the name of Edomites or Idumeans.