Babylonian and Assyrian god (identified with Adon), according to Klein's sources probably from Babylonian Du'uzu, contraction of Dumu-zi "the son who rises," also interpeted as "the faithful son."
Entries linking to tammuz
Thammuz n.
1530s, from Hebrew tammuz, tenth month of the Jewish civil year, fourth of the sacred, covering parts of June and July; also the name of a Syrian deity equivalent to Phoenician Adon, whose festival began with the new moon of this month (compare Tammuz).