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Family name Poirot (Poirot ) , all around the world, is quite a common cognomen. The last name Poirot is characteristic of Western Europe, particularly France, where it is quite a rare surname, Netherlands, where it is a rare surname, and Switzerland. In absolute terms, it is the most numerous in France, the United States, and Netherlands. Very seldom, Poirot is the forename as well as the last name.