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Globally, 久子 (Hisako , 久子 ) is quite a common feminine given name. The first name 久子 is habitual in Japan, where it is quite a rare female name, the United States, where it is a rare girly name, and Australia, where it is a very rare female name. Not in comparison with a country's population, the name is most common in Japan, the United States, and China. Much less frequently, 久子 is the last name as well as the forename.