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Family name Dedier (Dedier ) , throughout the world, is a rare surname. The last name Dedier is habitual in Saint Lucia, where it is quite a common surname, Trinidad and Tobago, and Belgium, where it is a rare surname. In absolute terms, this name is the most popular in Trinidad and Tobago, Belgium, and France. Very seldom, Dedier is the forename as well as the last name.