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Cognomen Omori (オオモリ , 大森 , Omori ) , throughout the world, is quite a common surname. The family name Omori is habitual in Kenya, where it is quite a rare surname, Japan, where it is a rare surname, and Nigeria. Measured by absolute frequency, this name is the most popular in Nigeria, China, and Japan. More frequently, Omori is the forename as well as the last name.