Cognomen Rooo (Rooo 
) , throughout the world, is a very rare surname. The cognomen Rooo is habitual in Malaysia, where it is a rare surname, Poland, where it is a very rare surname, and Thailand, where it is an extremely rare surname. Measured by absolute frequency, it most frequently occurs in Malaysia, Poland, and China. Much less frequently, Rooo is the forename as well as the last name.