1 Chronicles 4:15

“And the sons of Caleb the son of Jephunneh, etc.] Jephunneh is not the same with Hezron, as the Targum, but another son of Kenaz, hence called the Kenezite, (<061406>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 <041306>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.”

“Caleb: Num 13:6, Num 13:30, Num 14:6-10, Num 14:24, Num 14:30; Jos 14:6-14, Jos 15:13-20; Jdg 1:12-14 Kenaz: or, Uknaz 1 Chronicles 4:17”

“Of Iru, Elah, and Naam, the sons of Caleb the son of Jephunneh (cf. on Ch1 4:13), nothing more is known. To connect Elah with the Edomite chief of that name ( Ch1 1:52) is arbitrary. Of Elah's sons only "and Kenaz" is mentioned; the ו copul. before קנז shows clearly that a name has been dropped out before it. 1 Chronicles 4:16”