The Ezrahite was a designation applied to Ethan and Heman, men associated with wisdom and worship. In Scripture they are identified as sons or descendants of Zerah.
Definition
The Ezrahite is a title meaning “son of Zerah.” It was attached to Ethan and Heman.
Biblical Usage
Ethan is called the Ezrahite in 1 Kings 4:31 and Psalm 89, while Heman bears the title in Psalm 88.
Historical Bible Dictionaries
Smith's Bible Dictionary
(son of Zerah), a title attached to two persons—Ethan, (1 Kings 4:31; Psalms 89:1) title, and Heman, Psal 88:1 title.