Kommentar zu Bereschit 36:19

אלה בני עשו ואלה אלופיהם, the sons of Esau are the “patriarchs” all of whom have been mentioned as being Aluphim, heads of families, clans. Our sages in Sanhedrin 99 have said that every person named here as אלוף was in fact a king, except that he had not formally been “crowned.” The reason why the Torah bothered to list all these descendants of Esau was as a sign of respect for Yitzchok, just as the descendants of Yishmael had been listed at the end of Parshat Toldot as a sign of respect for Avraham. An additional reason for mentioning all these names is to teach us that it is important for any human being to know his antecedents, and after whom he himself has been named. In the case of Israelites this will help ensure that their legitimacy will not be challenged, that no one can call them mamzer, bastard, and get away with it. The Torah considers this so important that when referring to the Israelites entering lands which once belonged to the sons of Esau, it writes: “you are now crossing into territory of your brothers the sons of Esau.” (Deut. 2,4.)