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Surname Kosugi (コスギ , Kosugi
, 小杉
) , worldwide, is a rare family name. The family name Kosugi is habitual in Japan, where it is a rare surname, Switzerland, where it is a very rare surname, and Belgium. Measured by absolute frequency, it most frequently occurs in Japan, China, and Brazil. More frequently, Kosugi is the forename as well as the last name.