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All over the world, Oishi (オオイシ , Oishi , 大石 ) is quite a rare unisex first name. The given name Oishi is habitual in Bangladesh, where it is a rare girly name, China, where it is a very rare dominantly boy's, but seldom female name, and India, where it is a very rare feminine name. Much less frequently, Oishi is the last name as well as the forename.
Oishi is also a name for the fictitious and mythical characters: .