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Last name Jaro (Jaro , Jahr , ハロ ) , in all the world, is a common cognomen. The cognomen Jaro is characteristic of Norway, where it is quite a common surname, Philippines, where it is quite a rare surname, and Hungary. Not in comparison with a country's population, it is commonest in Philippines, Germany, and the United States. Also, Jaro is the forename as well as the last name.