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Surname Callen (Kalla
, カレン
, Callen
) , around the world, is a common cognomen. The last name Callen is characteristic of Cameroon, where it is quite a common surname, Japan, where it is quite a rare surname, and Namibia. Measured by absolute frequency, this name is the most popular in India, Japan, and Nigeria. Likewise, Callen is the forename as well as the last name.