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Cognomen Casier (Casier , Cazier , Cassiere ) , in all the world, is quite a common surname. The cognomen Casier is habitual in Western Europe, particularly Belgium, where it is quite a common surname, France, where it is quite a rare surname, and Luxembourg. Not in comparison with a country's population, this name is the most popular in France, Belgium, and the United States. Very seldom, Casier is the forename as well as the last name.