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Family name Rill (Rill , 里尔 , ลำธาร) , in all the world, is quite a rare last name. The cognomen Rill is habitual in Hungary, where it is quite a rare surname, Germany, and Austria, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Germany, the United States, and Hungary. Very seldom, Rill is the forename as well as the last name.