1 Chronicles 1:32-33

Now the sons of Keturah, Abraham’s concubine: she gave birth to Zimran, Jokshan, Medan, Midian, Ishbak, and Shuah. The sons of Jokshan: Sheba and Dedan. The sons of Midian: Ephah, Epher, Hanoch, Abida, and Eldaah. All these are the sons [and grandsons] of Keturah.