Genesis 11:29 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 .
According to Jewish tradition, Iscah (Yiskah) and Sarah were one and the same person (Talmud, Megillah 14a).
Thanks also to Diana Webb who sent me these references stating / suggesting that Iscah of Genesis 11: 29 is Sarai, who married Abram (Abraham).
 Kent P. Jackson, The Restored Gospel and the Book of Genesis, (Salt Lake City, Utah: Deseret Book, 2001),151 fn 3. Jackson notes that in the first printing of the book of Abraham text in 1842, Sarai and Milcah were identified as “the daughters of Haran,”making Sarai Abram’s niece. See Times and Seasons, 1 March 1842, 705.
Tuchman and Rapoport in The Passions of the Matriarchs also render this verse as “daughter[s].” See Shera Aranoff Tuchman and Sandra E. Rapoport, The Passions of the Matriarchs, (Jersey City, New Jersey: KTAV Publishing House, 2004), 3-4.
מִלְכָּה Milcah h4435 queen
יִסְכָּה Iscah h3252 one who looks forth
שָׂרַי Sarai h8297 princess