According to the Old Testament, Isaac’s son Jacob was renamed Israel.
Genesis describes Jacob as the younger twin son of Isaac and Rebekah and the brother of Esau. After wrestling with a mysterious figure at night, Jacob receives the name Israel, explained in the passage as connected with striving or struggling with God.
Jacob’s new name becomes especially important because his descendants are repeatedly called Israelites. Genesis also records that Jacob had twelve sons, whose families became associated with the twelve tribes of Israel. The name Israel therefore refers both to the individual patriarch and, later, to a people and a kingdom.
Jacob is also known by the name Israel in later biblical narratives. Esau was his older twin brother, while Joseph was one of Jacob’s sons. These relationships are important because the Old Testament presents the family line as Isaac, Jacob, and then the tribes descended from Jacob.