Surname ริ้ว (Rio 
, ริ้ว) , all around the world, is a common cognomen. The surname ริ้ว is habitual in Portugal, where it is quite a common surname, Spain, and Cabo Verde (explore the name in all countries). Measured by absolute frequency, it is the most numerous in Indonesia, Philippines, and France. More frequently, ริ้ว is the forename as well as the last name.