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Surname Sonnier (ソニア , Sonnier , 索尼尔) , around the world, is quite a common cognomen. The surname Sonnier is habitual in the United States, where it is quite a rare surname, France, and New Zealand, where it is a rare surname. Measured by absolute frequency, it is the most numerous in the United States, France, and Japan. Very seldom, Sonnier is the forename as well as the last name.