Numbers 3:18, 21, 24

These are the names of the [two] sons of Gershon by their families: Libni and Shimei

Of Gershon were the families of the Libnites and of the Shimeites. These are the families of the Gershonites.

and the leader of the fathers’ households of the Gershonites was Eliasaph the son of Lael.