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Surname Jania (Jania , Жания , Жанья ) , across the world, is quite a rare last name. The cognomen Jania is characteristic of Nicaragua, where it is quite a rare surname, Poland, and Honduras, where it is a rare surname. Not in comparison with a country's population, it most frequently occurs in Poland, India, and Mexico. More prevalently, Jania is the forename as well as the last name.