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Last name Sassen (Sasse , Sassen , סאסן ) , in the entire world, is a common cognomen. The cognomen Sassen is characteristic of Germany, where it is quite a common surname, Netherlands, where it is quite a rare surname, and Fiji. Measured by absolute frequency, the name is most common in Germany, the United States, and Brazil. Much less frequently, Sassen is the forename as well as the last name.