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Last name Saint-Louis (Saint-Louis , Saint Louis ) , in the entire world, is quite a rare family name. The cognomen Saint-Louis is habitual in Latin America and the Caribbean, particularly Haiti, where it is quite a common surname, the Dominican Republic, where it is quite a rare surname, and Jamaica. Not in comparison with a country's population, it is commonest in Haiti, France, and the United States. Very seldom, Saint-Louis is the forename as well as the last name. Parts of the name also exists independently as a first name Saint, and a first name Louis.