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Surname Sedgwick (Sedgwick , סדג'וויק ) , worldwide, is quite a common family name. The surname Sedgwick is habitual in Seychelles, where it is quite a common surname, the United Kingdom, where it is quite a rare surname, and Australia. Not in comparison with a country's population, this name is the most popular in the United Kingdom, the United States, and Australia. Much less frequently, Sedgwick is the forename as well as the last name.