John Gill Commentary Exodus 6:24

"And the sons of Korah: Assir, and Elkanah, and Abiasaph; these are the families of the Korahites." — Exodus 6:24 (ASV)

And the sons of Korah The eldest son of Izhar, who, though he proved a bad man, yet many of his posterity were good men, and are often mentioned in general in the titles of some of the psalms of David:

the immediate sons of Korah were Assir, and Elkanah, and Abiasaph .

Aben Ezra says, that Samuel the prophet was of the sons of Korah; perhaps what might lead him to it was, because his father's name was Elkanah, the name of one of these sons of Korah, but cannot be this Elkanah:

these are the families of the Korhites ; the heads of them, or from whom they descended.