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Surname ユウコ (Yuko , ユウコ , Yuuko ) , in the world, is a widespread last name. The last name ユウコ is habitual in Japan, where it is a common surname, Taiwan, where it is quite a rare surname, and Kenya, where it is a rare surname. Measured by absolute frequency, it is commonest in Japan, Indonesia, and China. Very seldom, ユウコ is the forename as well as the last name.