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Last name Blass (Blass , بلاس , 布拉斯 ) , in all the world, is quite a common family name. The surname Blass is characteristic of Nicaragua, where it is quite a common surname, Israel, where it is quite a rare surname, and Switzerland. In absolute terms, it is the most numerous in Germany, the United States, and Nicaragua. Much less frequently, Blass is the forename as well as the last name.