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Last name Komori (コモリ , 小森 , Komori ) , in the entire world, is quite a rare surname. The last name Komori is habitual in Estonia, where it is quite a rare surname, Hungary, where it is a rare surname, and Slovakia. In absolute terms, this name is the most popular in China, Japan, and Indonesia. More frequently, Komori is the forename as well as the last name.