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Globally, カズコ (Kazuko , カズコ ) is quite a common principally female, but very infrequently male forename. The first name カズコ is characteristic of Japan, where it is quite a rare feminine name, the United States, where it is a rare female name, and Australia. Measured by absolute frequency, it is commonest in Japan, the United States, and China. More prevalently, カズコ is the last name as well as the forename.
カズコ is also a name for the fictitious and mythical characters: Kazuko , the 2011 film Guilty of Romance character.