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Surname Gregg (Gregg , グレッグ , Грег , and others...) , in the entire world, is a common family name. The last name Gregg is habitual in Saint Vincent and the Grenadines, where it is quite a common surname, Guernsey, and Saint Lucia (explore the name in all countries). In absolute terms, it is the most numerous in the United States, the United Kingdom, and Australia. Likewise, Gregg is the forename as well as the last name.