Cognomen Ruzhin (Ruzhin 
, Ружин 
, Ружьин ) , throughout the world, is a rare surname. The cognomen Ruzhin is habitual in Eastern Europe, particularly Bulgaria, where it is quite a rare surname, Belarus, where it is a rare surname, and Ukraine. Measured by absolute frequency, the name is most common in Eastern Europe, particularly Ukraine, Russia, and Bulgaria. Very seldom, Ruzhin is the forename as well as the last name.