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Cognomen Fergus (Fergus , Fearghas , Фергус ) , globally, is quite a rare last name. The last name Fergus is habitual in Latin America and the Caribbean, particularly Saint Vincent and the Grenadines, where it is quite a common surname, Antigua and Barbuda, and Barbados. Measured by absolute frequency, the name is most common in the United States, the United Kingdom, and Australia. Also, Fergus is the forename as well as the last name.