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Throughout the world, Cais (Cail , Cais , Каис ) is a rare mostly boy's, but seldom feminine first name. The forename Cais is characteristic of Romania, where it is a rare boy's name, Australia, where it is a very rare boy's name, and Italy, where it is a very rare unisex name. Not in comparison with a country's population, it most frequently occurs in the United States, India, and Romania. More frequently, Cais is the last name as well as the forename.