Charles Ellicott Commentary 2 Chronicles 24:1

"Joash was seven years old when he began to reign; and he reigned forty years in Jerusalem: and his mother`s name was Zibiah, of Beer-sheba." — 2 Chronicles 24:1 (ASV)

REIGN OF JOASH. (Compare to 2 Kings 12:1)

PROPHETIC MINISTRY OF ZECHARIAH BEN JEHOIADA.

The Ascendancy of the High Priest Jehoiada. Repair of the Temple (2 Chronicles 24:1–14).

Joash was seven years old. —This verse coincides with 2 Kings 12:1–2, merely omitting the note that his accession took place in the seventh year of Jehu. There he is called Jehoash, of which Joash is a contraction. (Compare to Jehoram-Joram.) The meaning may be “Iahu is fire” ; but more probably it is “Iahu is a man” (Compare to Ashbel).