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Family name Clar (Clair , Clar ) , throughout the world, is a common last name. The surname Clar is characteristic of Marshall Islands, where it is a common surname, Saint Lucia, where it is quite a common surname, and Mauritius (explore the name in all countries). Measured by absolute frequency, it is commonest in the United States, France, and Philippines. Likewise, Clar is the forename as well as the last name.