Midianites: Descended Form Midian, Son of Abraham by Keturah

Now Abraham had taken another wife, named Keturah,

…and she bore him Zimran, Jokshan, Medan, Midian, Ishbak, and Shuah.

The sons born to Keturah, Abraham’s concubine: Zimran, Jokshan, Medan, Midian, Ishbak, and Shuah. The sons of Jokshan: Sheba and Dedan.