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Around the globe, Kosiro (Kosiro) is an extremely rare unknown gender first name.
Kohshiro, Kojiro, Kojo, Kojoh, Kojou, Koshiro, Koushiro, Ogi, Ojiro, Oshiro, Osiro, Кодзиро, Оги, コシロ, 古城, 小城, and 神代