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Cognomen Agst (Augustus , Agst ) , globally, is a common last name. The cognomen Agst is habitual in Trinidad and Tobago, where it is quite a common surname, Grenada, and Namibia (explore the name in all countries). Measured by absolute frequency, this name is the most popular in Nigeria, the United States, and Ghana. More frequently, Agst is the forename as well as the last name.