John Gill Commentary Numbers 3:19

"And the sons of Kohath by their families: Amram, and Izhar, Hebron, and Uzziel." — Numbers 3:19 (ASV)

And the sons of Kohath, by their families Who was the second son of Levi: Amram, and Izehar, Hebron, and Uzziel; so in (Exodus 6:18); and from whom were named the family of the Amramites, to which Moses and Aaron belonged; and the families of the Izeharites, Hebronites, and Uzzielites, as they are called, (Numbers 3:27).