Albert Barnes Commentary Jeremiah 28:4

"and I will bring again to this place Jeconiah the son of Jehoiakim, king of Judah, with all the captives of Judah, that went to Babylon, saith Jehovah; for I will break the yoke of the king of Babylon." — Jeremiah 28:4 (ASV)

Jeconiah - Zedekiah not being popular, the people would have preferred the young king, who had not reigned long enough to make enemies. Probably also Zedekiah had started for Babylon (Jeremiah 51:59).