The sons of Zerah: Zimri, and Ethan, and Heman, and Calcol, and Dara; five of them in all.
Zimri, and Ethan, and Heman, and Calcol, and Dara--These five are here stated to be the sons of Zerah, that is, of Ezra, whence they were called Ezrahites (Kg1 4:31). In that passage they are called "the sons of Mahol," which, however, is to be taken not as a proper name, but appellatively for "sons of music, dancing," &c.
And the sons of Ethan; Azariah. Including his posterity, see Gen 46:23, the posterity of the other three sons of Zerah are not mentioned, either because the writer could not find the genealogy of them, as Kimchi; or rather, as he thinks, he cuts short the genealogy of Zerah, because the kingdom did not proceed from him, and returns to the genealogy of Hezron, from...
These five names grouped as sons of Zerah appear nowhere else together. Zimri may be a scribal error for Zabdi, since Achan is called son of Zabdi in Joshua but son of Zimri here; genealogies often skip intermediate members. Ethan, Heman, Calcol, and Dara reappear in Kings as Solomon's wise men, but calling them brothers by blood rests on no foundation, Ethan is Ezrahite, while the others are sons of Machol, so identity remains uncertain.
AI summary
Commenting on 1 Chronicles 2:6-8