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Around the world, Koyamada (신 , Koyamada ) is a rare male first name. The first name Koyamada is characteristic of Eastern Asia, particularly South Korea, where it is a rare masculine name. Much more frequently, Koyamada is the last name as well as the forename.
Koyamada is also a name for the fictitious and mythical characters: Huang Xin , the Water Margin character and Bao Xin , the fictional Han dynasty general, figure in Romance of the Three Kingdoms.