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Cognomen Forsyth (Forsyth , Форсайт ) , all around the world, is a common surname. The surname Forsyth is characteristic of Grenada, where it is quite a common surname, New Zealand, and Australia (explore the name in all countries). Measured by absolute frequency, it is the most numerous in the United States, the United Kingdom, and Australia. Much less frequently, Forsyth is the forename as well as the last name.