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Last name Csillag (Csillag
, צ'ילאג
) , worldwide, is quite a rare surname. The surname Csillag is characteristic of Hungary, where it is quite a common surname, Romania, where it is quite a rare surname, and Iceland. In absolute terms, it most frequently occurs in Hungary, Romania, and the United States. Very seldom, Csillag is the forename as well as the last name.