John Gill Commentary Jeremiah 52:1

"Zedekiah was one and twenty years old when he began to reign; and he reigned eleven years in Jerusalem: and his mother`s name was Hamutal the daughter of Jeremiah of Libnah." — Jeremiah 52:1 (ASV)

Zedekiah [was] one and twenty years old when he began to reign, &c.] Whose name was Mattaniah; and who was set on the throne by the king of Babylon, in the room of his brother's son Jehoiachin, (2 Kings 24:17 2 Kings 24:18); and he reigned eleven years in Jerusalem; so that he was thirty two years of age when he was taken and carried captive into Babylon: and his mother's name [was] Hamutal the daughter of Jeremiah of Libnah; see (2 Kings 24:18).