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Family name Morikawa (モリカワ , Morikawa , 森川 ) , in the world, is quite a rare cognomen. The surname Morikawa is habitual in Hong Kong, where it is a rare surname, Japan, and Singapore. Measured by absolute frequency, the name is most common in the United States, Brazil, and Japan. More prevalently, Morikawa is the forename as well as the last name.