4 occurrences in 4 dictionaries
Reference: Susanchites
Easton
the inhabitants of Shushan, who joined the other adversaries of the Jews in the attempt to prevent the rebuilding of the temple (Ezr 4:9).
Fausets
Ezr 4:9-10. Descendants of some of the nations planted by Asnapper in Samaria. Inhabitants of Susiana or Susa.
Morish
Susanch'ites
Persons whom the Assyrians imported into Samaria. Ezr 4:9. They are supposed to have been from Susa.
Smith
Su'sanchites
is found once only --in
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.