Quote:Jews were already known as Jews.
"Jews" were not known as "Jews" until the Persian period when they renamed the region Yehud.
Quote:Following the fall of Babylon to the Persian Cyrus the Great, some Judean exiles returned to Jerusalem during the Persian period, inaugurating the formative period in the development of a distinctive Judahite identity in the Persian province of Yehud.
http://en.wikipedia.org/wiki/History_of_..._and_Judah