Nahash — Nahash is the name of Jesse's wife, by whom he had this Abigail, as he had Zeruiah by another wife; so they were sisters by the father, but not by the mother.
Related Commentaries of 2 Samuel 17:25
2 Samuel 17:25
25 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.