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Family name 井川 (Ikawa , 井川 ) , in all the world, is quite a rare last name. The cognomen 井川 is habitual in Qatar, where it is a rare surname, the Democratic Republic of the Congo, and Japan. Not in comparison with a country's population, the name is most common in the Democratic Republic of the Congo, Brazil, and China. Also, 井川 is the forename as well as the last name.