Malchiah in Fausset's Bible Dictionary

1. 1 Chronicles 6:40. 2. Ezra 10:25. 3. Ezra 10:31. 4. Nehemiah 3:14. 5. Nehemiah 3:31. 6. Nehemiah 8:4. 7. Nehemiah 11:12; Jeremiah 38:1. 8. Son of Hammelech, or "of the king" into whose dungeon Jeremiah was cast (Jeremiah 38:6). Jerahmeel also is called "son of Hammeleeh" or "the king" (Jeremiah 36:26), and Joash (1 Kings 22:26), and Maaseiah (2 Chronicles 28:7). Therefore the title is official, one of the royal family, exercising some of the royal prerogative.