And the sons of Caleb the son of Jephunneh
 Jephunneh is not the same with Hezron, as the Targum, but another son of Kenaz, hence called the Kenezite, ( Joshua 14:6 ) and brother of Othniel; and Caleb his son is the same that was sent one of the spies of the land of Canaan by Moses, see ( Numbers 13:6 ) ( 14:6 ) 
 his sons were Iru, Elah, and Naam;
 of whom we nowhere else read: 
 and the sons of Elah, even Kenaz;
 another Kenaz, or rather it should be read Uknaz; so Jarchi and Kimchi.