1 Chronicles 2:6 - Joseph Benson’s Commentary on the Old and New Testaments

And Dara If these be the same who are mentioned as the sons of Mahol, (1 Kings 4:31,) either the same man had two names, Zerah and Mahol, as was usual among the Hebrews, or one of these was their immediate father, and the other their grandfather. These are named, because they were the glory of their father's house. When the Holy Ghost would magnify the wisdom of Solomon, he saith, he was wiser than these four men. That four brothers should be so eminent, was a rare thing.