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Surname 恭子 (Kyoko , 恭子 , Kyōko) , throughout the world, is quite a rare last name. The family name 恭子 is habitual in Japan, where it is a rare surname, Singapore, and Indonesia, where it is a very rare surname. Not in comparison with a country's population, it is commonest in Japan, China, and Indonesia. More prevalently, 恭子 is the forename as well as the last name.