Family name ริโยะ (Rijo 
, ริโยะ) , in all the world, is a common surname. The surname ริโยะ is characteristic of the Dominican Republic, where it is quite a common surname, Uruguay, and Portugal. Measured by absolute frequency, it is the most numerous in the Dominican Republic, Portugal, and the United States. Likewise, ริโยะ is the forename as well as the last name.