ada4dADAD. ADAD is the Old Akkadian and Assyro-Babylonian name of the ancient Middle Eastern storm god, called Adda (Addu) or Hadda (Haddu) in northwest Semitic areas and known laterADAD. ADAD is the Old Akkadian and Assyro-Babylonian name of the ancient Middle Eastern storm god, called Adda (Addu) or Hadda (Haddu) in northwest Semitic areas and known later