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Last name Koryu (Koryu ) , around the world, is an extremely rare cognomen. Predominantly, Koryu is the forename as well as the last name.
コウリュウ
Ito, Iha, Aoki, Haku, Shono, Hirata, Shimizu, Kurehon, Morimoto, Kawatani, Gushiken, Iwabuchi, Watanabe, and Matsuyama