Cognomen Rujena (Ружена 
, Rujena 
) , all around the world, is a very rare surname. The cognomen Rujena is habitual in Armenia, where it is a rare surname, Bulgaria, and Georgia, where it is a very rare surname. Measured by absolute frequency, it most frequently occurs in India, Bulgaria, and Armenia. More prevalently, Rujena is the forename as well as the last name.