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Family name Schwager (Schwager , Szwagier , Swauger ) , around the globe, is quite a common surname. The last name Schwager is characteristic of Western Europe, particularly Switzerland, where it is quite a common surname, Germany, where it is quite a rare surname, and Austria. In absolute terms, this name is the most popular in Germany, the United States, and Switzerland. Much less frequently, Schwager is the forename as well as the last name.