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Cognomen 小森 (小森 , Komori , Омори ) , all over the world, is quite a rare surname. The last name 小森 is habitual in Estonia, where it is quite a rare surname, Hungary, where it is a rare surname, and Slovakia. Measured by absolute frequency, it is commonest in China, Indonesia, and Japan. More prevalently, 小森 is the forename as well as the last name.