1 Chronicles 1:32-33

Keturah, Abraham’s concubine, gave birth to Zimran, Jokshan, Medan, Midian, Ishbak, and Shuah. Then Jokshan had Sheba and Dedan. And Midian had Ephah, Epher, Hanoch, Abida, and Eldaah. These made up the Keturah branch.