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Family name Oishi (オオイシ , Oishi , 大石 ) , all over the world, is quite a common surname. The family name Oishi is characteristic of Bangladesh, where it is quite a rare surname, Japan, where it is a rare surname, and Singapore. In absolute terms, it is commonest in Bangladesh, Brazil, and Japan. More prevalently, Oishi is the forename as well as the last name.