Augustine of Hippo

But afterwards, when Abraham sent his servant to take a wife for his son Isaac, we find it thus written: "And the servant took ten camels of the camels of his lord, and of all the goods of his lord, with him; and arose, and went into Mesopotamia, into the city of Nahor." This and other testimonies of this sacred history show that Nahor, Abraham's brother, had also left the region of the Chaldeans and fixed his abode in Mesopotamia, where Abraham dwelt with his father. …

City of God 16.13 ↗

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

So Thare took Abram his son, and Lot the son of Haran, his son's son, and Sarai his daughter-in-law, the wife of Abram his son, and brought them out of Ur of the Chaldeans, to go into the land of Canaan. The old translation has, "he brought them out of the region of the Chaldeans," which poses no question at all. …

Commentary on Genesis (Hexaemeron) ↗