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Last name Sirk (Sirk , Сирк , سيرك ) , in the entire world, is quite a rare cognomen. The surname Sirk is habitual in Slovenia, where it is quite a common surname, Estonia, where it is quite a rare surname, and Croatia, where it is a rare surname. Measured by absolute frequency, this name is the most popular in the United States, Slovenia, and Estonia. Much less frequently, Sirk is the forename as well as the last name.