From Gershon came the Libnite clan and the Shimeite clan; these were the Gershonite clans.

Numbers 3:20
And the sons of Merari by their clans were Mahli and Mushi. These were the clans of the Levites, according to their families.

Numbers 3:22
The number of all the males a month old or more was 7,500.

Numbers 26:58
These were the families of the Levites: The Libnite clan, the Hebronite clan, the Mahlite clan, the Mushite clan, and the Korahite clan. Now Kohath was the father of Amram,

Of Gershon was the family of the Libnites, and the family of the Shimites: these are the families of the Gershonites.