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Family name Borel (Borel , בורל , Борел ) , in all the world, is a common last name. The cognomen Borel is habitual in France, where it is quite a common surname, Switzerland, and Trinidad and Tobago, where it is quite a rare surname. In absolute terms, it is the most numerous in France, Brazil, and the United States. Also, Borel is the forename as well as the last name.