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Cognomen ケイコ (Keiko , ケイコ ) , in the entire world, is a widespread family name. The family name ケイコ is habitual in Japan, where it is a common surname, Malaysia, where it is a rare surname, and Indonesia. In absolute terms, it is the most numerous in Japan, Indonesia, and China. Very seldom, ケイコ is the forename as well as the last name.