These are the families of the Levites: the family of the Libnites, the family of the Hebronites, the family of the Mahlites, the family of the Mushites, the family of the Korathites. And Kohath begat Amram. (Numbers 26:58)
See on v. 11. The Korathites are mentioned a number of times later on, in 1 Chron. 9:19 as doorkeepers, and in 2 Chron. 20:19 as choristers.
Mahlites.
A daughter or a family of Zelophehad is named Mahlah in v. 33, but the Mahlites and Mushites were from the two sons of Merari called Mahali and Mushi (Ex. 6:19; Num. 3:20).
Hebronites.
Descended from Hebron, a son of Kohath (Ex. 6:18; Num. 3:19). It would seem natural to connect these people with the city called Hebron, near Libnah.
Libnites.
Thought to be connected with Libnah in southern Judah. The Libnites were descendants from Libni, the eldest son of Gershon.