Cognomen Riuma (Riuma 
, Рюма 
, รีอุมา 
) , throughout the world, is a rare last name. The surname Riuma is characteristic of Ukraine, where it is a rare surname, Thailand, where it is a very rare surname, and Belarus. In absolute terms, it is the most numerous in Ukraine, Thailand, and Russia. Much less frequently, Riuma is the forename as well as the last name.