John Gill Commentary 1 Chronicles 4:8

"And Hakkoz begat Anub, and Zobebah, and the families of Aharhel the son of Harum." — 1 Chronicles 4:8 (ASV)

And Coz
Another son of Helah, and brother of the before mentioned:

begat Anub, and Zobebah ;
of whom we nowhere else read:

and the families of Aharhel, the son of Harum ;
these were of the posterity of Coz; the Targum is, "and the family of Aharhel, this is Hur, the firstborn of Miriam;" which is not at all probable.