Charles Ellicott Commentary 2 Kings 24:17

"And the king of Babylon made Mattaniah, [Jehoiachin`s] father`s brother, king is his stead, and changed his name to Zedekiah." — 2 Kings 24:17 (ASV)

Mattaniah his father’s brother. —He was the third son of Josiah (Jeremiah 37:1), and full brother of Jehoahaz-Shallum (2 Kings 23:31). Jehoiachin was childless at the time (compare 2 Kings 24:12; 2 Kings 24:15 with 2 Kings 25:7 and Jeremiah 22:30). In the exile he had offspring (1 Chronicles 3:17–18). (The Septuagint reads, his son, υἱὸν, a corruption of θεῖον, uncle.)

And changed his name to Zedekiah. —His former name meant “gift of Jah;” his new one, “Jah is righteousness” (or “myrighteousness”). The prophecy of Jeremiah (Jeremiah 23:1–9), denouncing the shepherds that destroy and scatter the flock and promising a future king, whose name shall be Jehovah is our righteousness (lahweh çidgçnu), evidently refers to the delusive expectations connected with Zedekiah’s elevation. Nebuchadnezzar’s act of clemency in putting another native prince on the throne may have been the execution of a promise made at the surrender of the city.