The sons of Levi: Gershon, Kohath, and Merari.
Levi's sons are named as Gershon, Kohath, and Merari.
It extends the genealogy through another of Leah's sons.
8Now these are the names of the sons of Israel (Jacob and his descendants) who went to Egypt: Reuben, Jacob’s firstborn. 9The sons of Reuben: Hanoch, Pallu, Hezron, and Carmi. 10The sons of Simeon: Jemuel, Jamin, Ohad, Jachin, Zohar, and Shaul the son of a Canaanite woman. 11The sons of Levi: Gershon, Kohath, and Merari. 12The sons of Judah: Er, Onan, Shelah, Perez, and Zerah; but Er and Onan died in the land of Canaan. 13The sons of Issachar: Tola, Puvah, Job, and Shimron. 14The sons of Zebulun: Sered, Elon, and Jahleel. 15These are the sons of Leah born to Jacob in Paddan-aram, in addition to his daughter Dinah. The total number of sons and daughters was thirty-three.