Cognomen Hiroo (Hiroo 
, هيروو 
, Хироо 
) , all around the world, is a rare surname. The surname Hiroo is characteristic of Japan, where it is a rare surname, Thailand, where it is a very rare surname, and Egypt. Not in comparison with a country's population, this name is the most popular in Japan, China, and India. Also, Hiroo is the forename as well as the last name.