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Last name Garside (Garth , Garside ) , around the globe, is a common surname. The surname Garside is characteristic of Nicaragua, where it is quite a common surname, Reunion, and the United Kingdom, where it is quite a rare surname. Not in comparison with a country's population, the name is most common in the United Kingdom, the United States, and Australia. Likewise, Garside is the forename as well as the last name.