Also called JETHER
Father of Amasa
And Absalom made Amasa captain of the host instead of Joab: which Amasa was a man's son, whose name was Ithra an Israelite, that went in to Abigail the daughter of Nahash, sister to Zeruiah Joab's mother. (2 Samuel 17:25)
And Abigail bare Amasa: and the father of Amasa was Jether the Ishmeelite. (1 Chronicles 2:17)