Proper noun
Jeconiah
(historical, biblical) An ancient king of Judah, the son and successor of King Jehoiakim, who was dethroned by the King of Babylon in the 6th century BC and taken into captivity.
Hipppolytus, a 3 century Christian, even denied that the Jeconiah condemned by Jeremiah was the same one recorded in Matthew’s genealogy. Source: Internet