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Family name Цао (Cao , Tsao , Цао ) , in all the world, is a prevalent last name. The cognomen Цао is characteristic of Cayman Islands, where it is a common surname, Bermuda, and China (explore the name in all countries). Not in comparison with a country's population, this name is the most popular in China, Vietnam, and the United States. Much less frequently, Цао is the forename as well as the last name.