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All around the world, 古屋 (Kashin , 古屋 , Коя ) is quite a common masculine given name. The first name 古屋 is habitual in Japan, where it is quite a rare boy's name, Nigeria, where it is a very rare mostly boy's, but uncommonly feminine name, and India. Much less frequently, 古屋 is the last name as well as the forename.