As for the Amramites, Izharites, Hebronites, and Uzzielites:

Shelomoth from the Izharites, Jahath from the sons of Shelomoth.

As for the Izharites: Kenaniah and his sons were given responsibilities outside the temple ¹  as officers and judges over Israel.

From Kohath came the family of the Amramites, the family of the Izharites, the family of the Hebronites, and the family of the Uzzielites; these were the families of the Kohathites. ¹