Midian was one of the six sons of Abraham and his concubine Keturah. When Abraham gave most of his estate to Isaac, he sent his other sons to a land in the east (Genesis 25:6). Midian's descendants became the Midianites, a nomadic tribe. The Midianites are the ones who pulled Joseph up out of the cistern and took him to Egypt (Genesis 37:28). Later, Moses married the daughter of a Midianite priest, Jethro.
Next person in the Bible: Milkah, daughter of Haran