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Cognomen 辛辛 (Xinxin , 辛辛 ) , worldwide, is quite a rare surname. The last name 辛辛 is characteristic of Taiwan, where it is a rare surname, Singapore, and Switzerland, where it is a very rare surname. In absolute terms, the name is most common in China, Taiwan, and Indonesia. Much more prevalently, 辛辛 is the forename as well as the last name.