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Cognomen Jost (Jost , Йост , ג'וסט ) , all over the world, is a common last name. The surname Jost is habitual in Western Europe, particularly Switzerland, where it is quite a common surname, Luxembourg, and Germany (explore the name in all countries). Measured by absolute frequency, this name is the most popular in Germany, Switzerland, and the United States. Very seldom, Jost is the forename as well as the last name.