Ahinadab the son of Iddo had Mahanaim:

And the name of Saul's wife was Ahinoam, the daughter of Ahimaaz: and the name of the captain of his host was Abner, the son of Ner, Saul's uncle.

And Kish was the father of Saul; and Ner the father of Abner was the son of Abiel.

And when Abner was returned to Hebron, Joab took him aside in the gate to speak with him quietly, and smote him there under the fifth rib, that he died, for the blood of Asahel his brother.

For all the people and all Israel understood that day that it was not of the king to slay Abner the son of Ner.