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Cognomen Hertlein (Hertlein ) , around the world, is quite a rare family name. The family name Hertlein is characteristic of Western Europe, particularly Germany, where it is quite a rare surname, Switzerland, where it is a rare surname, and Austria. Measured by absolute frequency, it most frequently occurs in Germany, the United States, and Canada. Very seldom, Hertlein is the forename as well as the last name.