The sons of Kohath [were] Amram, Izhar, Hebron, and Uzziel- four [in all].

and the sons of Kohath according to their families: Amram and Izehar, Hebron and Uzziel;

To Kohath [belonged] one division, that of Amram, and another division, that of Izehar, and another division, that of Hebron, and another division, that of Uzziel: these are the divisions of Kohath, according to number.