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Surname キヨコ (Kiyoko , キヨコ ) , worldwide, is a common last name. The last name キヨコ is characteristic of Japan, where it is quite a common surname, the Democratic Republic of the Congo, where it is a rare surname, and Myanmar, where it is a very rare surname. In absolute terms, it is the most numerous in Japan, the Democratic Republic of the Congo, and China. More frequently, キヨコ is the forename as well as the last name.