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Family name Kerlo (Kerl , Kerlo ) , across the world, is quite a rare cognomen. The surname Kerlo is habitual in Western Europe, particularly Germany, where it is quite a rare surname, Austria, where it is a rare surname, and France. Not in comparison with a country's population, the name is most common in Germany, the United States, and France. Very seldom, Kerlo is the forename as well as the last name.