Family name リユ (Rieu 
, リユ 
) , across the world, is quite a rare cognomen. The last name リユ is habitual in France, where it is quite a rare surname, Malaysia, where it is a rare surname, and Argentina. Not in comparison with a country's population, the name is most common in France, Japan, and Argentina. Much less frequently, リユ is the forename as well as the last name.