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Family name Cler (Clair , Klar , Cler ) , in the entire world, is a common cognomen. The family name Cler 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, the name is most common in the United States, France, and Germany. Also, Cler is the forename as well as the last name.