Jamieson, Fausset and Brown on Jeremiah 52:31

31. (2Ki 25:27-30).

five and twentieth day--but in 2Ki 25:27, it is "the twenty-seventh day." Probably on the twenty-fifth the decree for his elevation was given, and the preparations for it made by releasing him from prison; and on the twenty-seventh day it was carried into effect.

Evil-merodach--son and successor of Nebuchadnezzar [Lyra]; and the Hebrew writers say that during Nebuchadnezzar's exclusion from men among beasts, Evil-merodach administered the government. When Nebuchadnezzar at the end of seven years was restored, hearing of his son's misconduct and that he had exulted in his father's calamity, he threw him into prison, where the latter met Jeconiah and contracted a friendship with him, whence arose the favor which subsequently he showed him. God, in his elevation, rewarded his having surrendered to Nebuchadnezzar (compare Jr 38:17 with 2Ki 24:12).

lifted up ... head--(Compare Ge 40:13, 20; Psa 3:3; 27:6).