Cognomen ریو (Riyo 
, Rijo 
, ریو) , around the globe, is a common last name. The last name ریو is habitual in the Dominican Republic, where it is quite a common surname, Uruguay, and Portugal. Measured by absolute frequency, this name is the most popular in the Dominican Republic, Indonesia, and Portugal. Also, ریو is the forename as well as the last name.