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Family name 一真 (Yizhen , 一真 ) , globally, is a rare cognomen. The surname 一真 is habitual in Singapore, where it is a rare surname, Malaysia, where it is a very rare surname, and China. Measured by absolute frequency, it is the most numerous in China, Malaysia, and the United States. Much more frequently, 一真 is the forename as well as the last name.