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Surname Krein (克林 , Kerin , Krein ) , in all the world, is a common cognomen. The cognomen Krein is characteristic of Slovenia, where it is quite a common surname, Honduras, and Ireland, where it is quite a rare surname. Measured by absolute frequency, it is the most numerous in China, the United States, and Brazil. Also, Krein is the forename as well as the last name.