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Surname Wallen (Wallen , 沃伦 , والن) , worldwide, is quite a common cognomen. The cognomen Wallen is habitual in Guernsey, where it is quite a common surname, Jamaica, and Trinidad and Tobago, where it is quite a rare surname. Measured by absolute frequency, it most frequently occurs in the United States, Sweden, and the United Kingdom. Much less frequently, Wallen is the forename as well as the last name.