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Cognomen Pierrat (Pierrat ) , in all the world, is quite a rare family name. The last name Pierrat is characteristic of Western Europe, particularly France, where it is quite a rare surname, Luxembourg, and Belgium, where it is a rare surname. Measured by absolute frequency, this name is the most popular in France, Belgium, and the United States. Much less frequently, Pierrat is the forename as well as the last name.