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Family name マサコ (Masako , マサコ ) , globally, is a common surname. The family name マサコ is characteristic of Japan, where it is quite a common surname, Taiwan, where it is quite a rare surname, and South Africa, where it is a rare surname. Measured by absolute frequency, this name is the most popular in Eastern Asia, particularly Japan, Taiwan, and China. Likewise, マサコ is the forename as well as the last name.