Holman Bible Dictionary
(hahssh' uh muh) Personal name, an abbreviated form of Jehoshama, “Yahweh heard.” Descendant of David during the Exile (1 Chronicles 3:18 ).
Fausset's Bible Dictionary
Son of Jehoiachin, or Jeconiah (1 Chronicles 3:18). In Jehoiachin's capture by Nebuchadnezzar his mother and wives are mentioned, but not his sons (2 Kings 24:12; 2 Kings 24:15), and he is doomed to be "childless" in Jeremiah 22:30. Either there is confusion of the genealogies in 1 Chronicles 3, or, as Matthew 1:12 says "Jeconias begat Salathiel," by "childless" Jeremiah means he should have no lineal heir to the throne, as Jeremiah adds, "no man of his seed shall prosper ... sitting upon the throne of David."