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Cognomen Koyasu (子安 , Koyasu ) , in the world, is quite a rare last name. The cognomen Koyasu is habitual in China, where it is a rare surname, Japan, where it is a very rare surname, and Indonesia. More prevalently, Koyasu is the forename as well as the last name.
VARIANT | COUNTRY |
---|---|
子安 | China |
Koyasu | Indonesia, Japan, China, Germany, United States |