Zelek the Ammonite
Who was so either by birth, and became a proselyte; so the Targum says, he was of the children of Ammon; or is so called, because he had sojourned some time in their land, or had done some exploits against them; unless he was of Chepharhaammonai, a city of the tribe of Benjamin, ( Joshua 18:24 ) ;
Naharai the Beerothite;
native of Beeroth, a city in the same tribe, ( Joshua 18:25 ) ;
armourbearer to Joab the son of Zeruiah;
Joab had ten of them, this perhaps was the chief of them, ( 2 Samuel 18:15 ) ; who was advanced to be a captain, and therefore has a name and place among the thirty, very likely for some military, exploits performed by him; he is in the list of David's worthies, though not Joab his master, as before observed; the reason of Joab being left out is either because he was over them all, as before noted; according to Josephus F20, Uriah the Hittite, after mentioned, was an armourbearer to Joab.
F20 Antiqu. l. 7. c. 7. sect. 1.