John Gill Commentary 1 Chronicles 6:22

"The sons of Kohath: Amminadab his son, Korah his son, Assir his son," — 1 Chronicles 6:22 (ASV)

Ver. 22-28. The sons of Kohath, Amminadab
The same with Izhar, (1 Chronicles 6:2 1 Chronicles 6:18 1 Chronicles 6:38) the posterity of his brethren, Amram, Hebron, and Uzziel, are omitted; and his genealogy is carried to a considerable length, for the sake of Samuel the prophet, who sprang from him: it stands thus, Korah, Assir, Elkanah, Ebiasaph, Assir, Tahath, Uriel, called Zephaniah, (1 Chronicles 6:36) Uzziah, the same with Azariah, (1 Chronicles 6:36) . Shaul, whose name is Joel, (1 Chronicles 6:36) then through the sons of Elkanah, before mentioned, Amasai, Ahimoth, called Mahath, (1 Chronicles 6:35) another Elkanah, Zophai, or Zuph, (1 Chronicles 6:35) . Nahath, the same with Toah, (1 Chronicles 6:34) and Tohu, (1 Samuel 1:1) , Eliab, called Eliel, (1 Chronicles 6:34) , and Elihu, (1 Samuel 1:1) , Jeroham, another Elkanah, the father of Samuel the prophet, whose firstborn was Vashni, and whose name also was Joel, (1 Chronicles 6:33) (1 Samuel 8:2) and so here it is read in the Syriac and Arabic versions:

and his second son Abiah .