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In all the world, 忠彦 (Zhongyan , 忠彦 , Tadahiko ) is quite a rare epicene given name. The first name 忠彦 is habitual in Cyprus, where it is quite a rare female name, Taiwan, where it is a rare feminine name, and China, where it is a rare gender-neutral name. Measured by absolute frequency, it most frequently occurs in Eastern Asia, particularly China, Taiwan, and Japan. Much less frequently, 忠彦 is the last name as well as the forename.