Strong's #3324: Yitshar (pronounced yits-hawr')
 the same as 3323; Jitshar, an Israelite:--Izhar.
Brown-Driver-Briggs Hebrew Lexicon:
 
  yitshâr 
 
 Izhar = "shining oil" 
 1) son of Kohath, grandson of Levi, uncle of Moses and Aaron, and father of Korah; progenitor of the Izharites
 
  Part of Speech: noun proper masculine
Relation: the same as H3323
Usage:
This word is used 9 times:
Exodus 6:18: "And the sons of Kohath; Amram,  and Izhar, and Hebron, and Uzziel: and the years of the life"
Exodus 6:21: "And the sons  of Izhar; Korah, and Zichri."
Numbers 3:19: "of Kohath by their families;  and Izehar, Hebron, and Uzziel."
Numbers 16:1: "Now Korah, the son  of Izhar, of Kohath, the son of Levi, and Dathan"
1 Chronicles 6:2: "And the sons of Kohath; Amram,  Izhar, and Hebron, and Uzziel."
1 Chronicles 6:18: "And the sons of Kohath were, Amram,  and Izhar, and Hebron, and Uzziel."
1 Chronicles 6:38: "The son  of Izhar, the son the son of Levi, the son of Israel."
1 Chronicles 23:12: "The sons of Kohath; Amram,  Izhar, Hebron, and Uzziel, four."
1 Chronicles 23:18: "Of the sons  of Izhar; Shelomith"