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Cognomen Maddy (Maddy , مادي , 马迪 ) , in the world, is quite a common last name. The family name Maddy is habitual in Libya, where it is quite a common surname, United Arab Emirates, where it is quite a rare surname, and Qatar. Not in comparison with a country's population, the name is most common in Libya, the United States, and India. Likewise, Maddy is the forename as well as the last name.