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Family name Placid (Placide , Placid , Placidus ) , across the world, is quite a common last name. The cognomen Placid is habitual in Saint Lucia, where it is quite a common surname, Martinique, and Rwanda. Not in comparison with a country's population, it most frequently occurs in Rwanda, Haiti, and France. More prevalently, Placid is the forename as well as the last name.