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Cognomen Harlo (Harlo , Харло , هارلو ) , across the world, is a rare surname. The cognomen Harlo is habitual in Northern Europe, particularly Estonia, where it is a rare surname, Finland, and Norway. Not in comparison with a country's population, the name is most common in Russia, Finland, and the United States. Also, Harlo is the forename as well as the last name.