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Surname 川原 (川原 , Kawahara ) , in all the world, is quite a rare last name. The surname 川原 is habitual in Montenegro, where it is quite a rare surname, Hong Kong, where it is a rare surname, and Jamaica. Not in comparison with a country's population, this name is the most popular in the United States, Japan, and Brazil. Much less frequently, 川原 is the forename as well as the last name.