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Family name 斯斯 (Sisi , 斯斯 ) , throughout the world, is a common cognomen. The last name 斯斯 is characteristic of Algeria, where it is quite a common surname, Lebanon, and Macao, where it is quite a rare surname. Not in comparison with a country's population, it is the most numerous in Algeria, Egypt, and China. Likewise, 斯斯 is the forename as well as the last name.