Ithra

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.

And Abigail bare Amasa: and the father of Amasa was Jether the Ishmeelite.