Hattush = "assembled"

 1) a descendant of David, apparently one of the sons of Shechaniah,
    in the 4th or 5th generation from Zerubbabel
    1a) a man who returned with Ezra; maybe same as 1 above
    1b) a man who returned with Zerubbabel; maybe same as 1 above
 2) son of Hashabniah who helped repair the walls of Jerusalem with
    Nehemiah