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Worldwide, こやま (Koyama , こやま) is a rare dominantly male, but infrequently female first name. The given name こやま is habitual in Japan, where it is a very rare masculine name, China, where it is a very rare largely male, but infrequently feminine name, and India, where it is an extremely rare gender-neutral name. More frequently, こやま is the last name as well as the forename.
こやま is also a name for the fictitious and mythical characters: .