Cognomen Харро (Harro 
, Харро 
) , throughout the world, is a rare last name. The last name Харро is habitual in Estonia, where it is quite a rare surname, Morocco, where it is a rare surname, and Australia. Not in comparison with a country's population, it is commonest in India, the United States, and Indonesia. More prevalently, Харро is the forename as well as the last name.