Augustine of Hippo

"And Abram and Nahor took them wives: the name of Abram's wife was Sarai; and the name of Nahor's wife Milcah, the daughter of Haran, the father of Milcah, and the father of Iscah." This Iscah is supposed to be the same as Sarai, Abraham's wife.

City of God 16.12 ↗

Jerome

And Abram and Nachor took wives for themselves. The name of Abram's wife was Sarai, and the name of Nachor's wife was Milcah, the daughter of Haran. The father of Milcah was also the father of Iscah. Haran fathered two daughters, Milcah and Iscah, who were both called by the same name. Of these, Milcah became the wife of Nachor, and Sarai became the wife of Abram. At that time, marriage between cousins and between siblings was not yet prohibited by law, as it later became among all people, even among brothers and sisters.

Hebrew Questions on Genesis ↗

Bede

Abram and Nachor took wives. The name of Abram's wife was Sarai, and the name of Nachor's wife was Melcha, the daughter of Aran, the father of Melcha and the father of Jescha. Our elders say that Jescha is the same as Sarai, the wife of Abraham, since evidently the brothers Abraham and Nachor had two sisters, the daughters of Aran, as wives. But if this is so, Aran, their father, cannot be the one who was the younger brother of Abraham and Nachor, but instead must be another person with the same name. …

Commentary on Genesis (Hexaemeron) ↗