Brown Driver Briggs

 Jeconiah = "Jehovah will establish"
1. son of king Jehoiakim of Judah and king of Judah for 3 months and
10 days before he surrendered to Nebuchadnezzar and was taken
captive to Babylon where he was imprisoned for the next 36 years;
released at the death of Nebuchadnezzar and lived in Babylon until
his death
  1) primary spelling 'Jehoiachin'