Ishmael is mentioned 21 times in scripture, across 2 books of the Old Testament. First named in scripture around 588 BC.
The son of Nethaniah, “of the seed royal” (Jer. 40:8, 15). He plotted against Gedaliah, and treacherously put him and others to death. He carried off many captives, “and departed to go over to the Ammonites.”