Then the people of Jerusalem made Ahaziah, the youngest son of Jehoram, king in his place, since the raiders who had come into the camp with the Arabs had killed all the older sons. So Ahaziah son of Jehoram became king of Judah.
We have here an account of the reign of Ahaziah, a short reign (of one year only), yet long enough, unless it had been better. He was called Jeho-ahaz (Ch2 21:17); here he is called Ahaz-iah, which is the same name and of the same signification, only the words of which it is compounded are transposed.
Commenting on 2 Chronicles 22:1-9
And the inhabitants of Jerusalem made Ahaziah his youngest son king in his stead,.... He being the only surviving one of the sons of Jehoram, the same with Jehoahaz, Ch2 21:17 who was saved when the rest were taken captive and slain, by his mother Athaliah, and he made his escape, and that she also escaped is clear from Ch2 22:10.
And the inhabitants of Jerusalem made Ahaziah his youngest son king in his stead: for the band of men that came with the Arabians to the camp had slain all the eldest. So Ahaziah the son of Jehoram king of Judah reigned. (a) Meaning the Philistines.