Easton's Bible Dictionary (1897)
The inhabitants of Shushan, who joined the other adversaries of the Jews in the attempt to prevent the rebuilding of the temple (Ezra 4:9).
Smith's Bible Dictionary (1863)
is found once only—in (Ezra 4:9) There can be no doubt that it designates either the inhabitants of the city Susa or those of the country—Susis or Susiana. Perhaps the former explanation is preferable.