Albert Barnes Commentary 2 Chronicles 21:17

"and they came up against Judah, and brake into it, and carried away all the substance that was found in the king`s house, and his sons also, and his wives; so that there was never a son left him, save Jehoahaz, the youngest of his sons." — 2 Chronicles 21:17 (ASV)

Jehoahaz - The writer of Chronicles calls him interchangeably Jehoahaz and Ahaziah, which are equivalent names (2 Kings 8:24 note).