Russian ruler during the 1930s?
Joseph Stalin was the Russian ruler from the mid-1920's until he died in 1953. Under Stalin, the state controlled all aspects of Russian's life. Threats of labor camps deterred the people from breaking the rules. Stalin's aim was to create the perfect communist society.
An educated guess would be that during the Soviet-German War a compilation occurred during this time with the German name Ruy (Lineage from the Visigoths, meaning famous ruler or King) and the Russian name Rybal denoting that a Ruy family settled in Russia or married into the Russian lineage of Rybal contributing to the compilation Ruybal.
Joseph Stalin is the most infamous Russian dictator. He was communistic and killed 20-30 million of his own people during his reign of terror. His successors and predecessors were also very cruel and authoritarian. There are many Russian kings or Czars that were cruel dictators such as Ivan the Terrible, hence his name.
The Russian revolution is mainly characterized as the fall of the Czarist-autocracy. Along with all of the suffering suffered during the revolution, and under the ruler Stalin there were some positives, such as, educational growth, equal rights to all the nationalities in the republic, and Russia emerging as a world power.