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Last name Agos (August , Agos , اغوس) , in all the world, is a common cognomen. The cognomen Agos is habitual in Belize, where it is a common surname, Tanzania, where it is quite a rare surname, and South Africa. Measured by absolute frequency, this name is the most popular in the United States, South Africa, and Tanzania. More prevalently, Agos is the forename as well as the last name.