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Family name Cau (驹 , 求 , Cau ) , all over the world, is a widespread cognomen. The family name Cau is characteristic of China, where it is quite a common surname, Italy, and Mozambique, where it is quite a rare surname. Not in comparison with a country's population, it is the most numerous in China, Italy, and France. Much less frequently, Cau is the forename as well as the last name.