Surname Ниархос (Niarchos 
, Niarkos 
, Ниархос) , around the globe, is a rare family name. The cognomen Ниархос is habitual in Greece, where it is quite a rare surname, Hong Kong, where it is a rare surname, and Australia. Not in comparison with a country's population, the name is most common in Greece, the United States, and Australia. Much less frequently, Ниархос is the forename as well as the last name.