Charles Ellicott Commentary 2 Kings 14:21

"And all the people of Judah took Azariah, who was sixteen years old, and made him king in the room of his father Amaziah." — 2 Kings 14:21 (ASV)

All the people of Judah. —Thenius explains, all the men of war, as in 2 Kings 13:7.

Took. —The expression seems to imply that Azariah was not the eldest son. As Amaziah was fifty-nine years old at his death, he probably had sons older than sixteen. Azariah was therefore chosen as a popular, or perhaps military, favourite.

Azariah. —See Note on 2 Chronicles 26:1. Thenius thinks the soldiery gave Azariah the name of Uzziah. At all events, the king may have taken a new name on his accession, though which of the two it was we cannot say. (Compare to 2 Kings 24:17.) Sennacherib on investing Esarhaddon with sovereignty named him Asshurebil-mukin-pal.