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Surname Haout (Altus , Haout , Hault ) , throughout the world, is a rare family name. The cognomen Haout is characteristic of Slovakia, where it is quite a rare surname, Belgium, where it is a rare surname, and Croatia. Not in comparison with a country's population, this name is the most popular in Germany, the United States, and Slovakia. Likewise, Haout is the forename as well as the last name.