Family name هييرو (Hierro 
, هييرو) , in all the world, is quite a common last name. The last name هييرو is characteristic of Marshall Islands, where it is a common surname, the Dominican Republic, where it is quite a common surname, and Spain, where it is quite a rare surname. In absolute terms, it is commonest in Spain, the Dominican Republic, and Philippines. Also, هييرو is the forename as well as the last name.