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Family name Sierżant (Sergent , Sergeant , Sierżant) , in all the world, is a common last name. The last name Sierżant is characteristic of Saint Vincent and the Grenadines, where it is quite a common surname, France, and Jamaica, where it is quite a rare surname. Measured by absolute frequency, this name is the most popular in France, the United States, and the United Kingdom. Very seldom, Sierżant is the forename as well as the last name.