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Cognomen Syren (Siren , Syren , Сирен ) , in all the world, is quite a common family name. The cognomen Syren is characteristic of Northern Europe, particularly Finland, where it is quite a common surname, Sweden, where it is quite a rare surname, and Estonia. Measured by absolute frequency, it is the most numerous in Finland, Sweden, and the United States. Much less frequently, Syren is the forename as well as the last name.