None of the actors are of Persian or Jewish descent. F. Murray Abraham, who is of Assyrian descent, is the only actor in the film of known Middle Eastern descent.
King Ahasuerus promoted Haman's popularity, after Esther was picked as the Babylonian queen, replacing Vashti, not before. Her Jewish name is Hadassah and Esther is her Babylonian name. Evidence: Holy Bible, Old Testament book, Esther, Chapters 2 and 3.