Which king of Babylon released King Jehoiachin from prison in the 37th year of his exile?

Answer: Evil-merodach

In the year Evil-merodach became king of Babylon, he released Jehoiachin of Judah from prison.

“On the twenty-seventh day of the twelfth month of the thirty-seventh year of the exile of Judah’s King Jehoiachin, in the year Evil-merodach became king of Babylon, he released King Jehoiachin of Judah from prison.”— 2 Kings 25:27 (BSB)