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Surname Guillemot (Guillemot , Гийемо) , worldwide, is a common cognomen. The cognomen Guillemot is characteristic of Western Europe, particularly France, where it is quite a common surname, Switzerland, where it is a rare surname, and Belgium. Measured by absolute frequency, it is commonest in France, Kenya, and Switzerland. Very seldom, Guillemot is the forename as well as the last name.