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Surname 春日 (春日 , Chunri , Kasuga ) , in the entire world, is quite a rare family name. The cognomen 春日 is habitual in Tanzania, where it is quite a rare surname, Hong Kong, where it is a rare surname, and Japan. Measured by absolute frequency, this name is the most popular in Tanzania, China, and Japan. Likewise, 春日 is the forename as well as the last name.