John Gill's  Exposition of the Bible 

1 Chronicles 4:2

And Reaiah the son of Shobal begat Jahath; and Jahath begat Ahumai, and Lahad. These are the families of the Zorathites.

And Reaiah the son of Shobal begat Jahath,.... Reaiah is the same with Haroeh, 1 Chronicles 2:52 the names are of the same signification:

and Jahath begat Ahumai, and Lahad. These are the families of the Zorathites; who inhabited Zoreah, as the Targum, at least part of it; see 1 Chronicles 2:53.