from an unused root meaning to watch; observant; Jiskah, sister of Lot; Iscah.
Usages throughout the bible
Genesis 11:29
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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. H3252