Most the tribes of Esav do not have wives listed among the husbands, yet we find (Bereishis 36:39)
וַיָּמָת בַּעַל חָנָן בֶּן־עַכְבּוֹר וַיִּמְלֹךְ תַּחְתָּיו הֲדַר וְשֵׁם עִירוֹ פָּעוּ וְשֵׁם אִשְׁתּוֹ מְהֵיטַבְאֵל בַּת־מַטְרֵד בַּת מֵי זָהָב׃
And when Baal-hanan son of Achbor died, Hadar succeeded him as king; the name of his city was Pau, and his wife’s name was Mehetabel daughter of Matred daughter of Me-zahab.
What is so significant about this wife in contrast to the others that it was worthy of recognition in the Torah?