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Last name Gaston (Gaston , غاستون , גסטון ) , in all the world, is a common family name. The surname Gaston is characteristic of Latin America and the Caribbean, particularly Saint Lucia, where it is quite a common surname, Argentina, and Uruguay (explore the name in all countries). Measured by absolute frequency, it is the most numerous in the United States, Argentina, and Mexico. More prevalently, Gaston is the forename as well as the last name.