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Last name Jassen (Ясен , Jassen ) , all over the world, is quite a rare cognomen. The last name Jassen is habitual in Bulgaria, where it is quite a rare surname, Mauritius, and South Africa, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Bulgaria, South Africa, and Ukraine. Likewise, Jassen is the forename as well as the last name.