C. F. Keil and Franz Delitzsch on 1 Chronicles 4:15

1Ch 4:15

Of Iru, Elah, and Naam, the sons of Caleb the son of Jephunneh (cf. on 1Ch 4:13), nothing more is known. To connect Elah with the Edomite chief of that name (1Ch 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.Descendants of various men, whose genealogical connection with the sons and grandsons of Judah, mentioned in 1Ch 4:1, is not given in the text as it has come to us.