This is someone who is from the region of Gilead. It is a coincidence that his father's name is also Gilead. See Judges 10:3. Jephthah was half Israelite and half Canaanite by birth. While all of the judges were called by Yahweh, it is the leaders who called Jephthah to help them, but Yahweh still used Jephthah to help them.