Genesis 16:15: "And Hagar bare Abram a son: and Abram called his son's name, which Hagar bare, Ishmael."
Genesis 25:1: “Then again Abraham took a wife, and her name was Keturah. ”
Genesis 25:2: “And she bare him Zimran, and Jokshan, and Medan, and Midian, and Ishbak, and Shuah. ”