Easton's Bible Dictionary (1897)
Jehovah his brother; i.e., helper. (1.) One of the sons of Obed-edom (1 Chr. 26:4), a Korhite porter. (2.) A Levite of the family of Gershom (1 Chr. 6:21), probably the same as Ethan (42). (3.) The son of Asaph, and “recorder” (q.v.) or chronicler to King Hezekiah (2 Kings 18:18, 26, 37). (4.) Son of Joahaz, and “recorder” (q.v.) or keeper of the state archives under King Josiah (2 Chr. 34:8).
Smith's Bible Dictionary (1863)
(whose brother (i.e. helper) is Jehovah).
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
JO'AH (whose brother, i.e. helper, is Jehoivah). The son of Asaph, the royal recorder under Hezekiah. 2 Kgs 18:18, 2 Kgs 18:26, 2 Kgs 18:37, Isa 36:3, Isa 36:11, Isa 36:22. A Gershonite, 1 Chr 6:21; probably same as Ethan, 1 Chr 6:42. A Korhite porter. 1 Chr 26:4. A Gershonite Levite who took part in Hezekiah's reforms. 2 Chr 29:12. The son of Joahaz, and recorder to Josaiah. 2 Chr 34:8.
Hitchcock's Bible Names (1869)
fraternity; brother of the Lord