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Family name Rosti (Rost , Rosti , Рости ) , around the world, is a common last name. The family name Rosti is habitual in San Marino, where it is quite a common surname, Germany, and Switzerland, where it is quite a rare surname. Measured by absolute frequency, this name is the most popular in Germany, the United States, and Brazil. Much less frequently, Rosti is the forename as well as the last name.