The court overturned an earlier suspended sentence for the same term. Staviski, 31, was found guilty of crashing his car into an oncoming vehicle in August 2007. A 23-year-old man died and an 18-year-old woman was severely injured in the accident.
Police records showed Staviski's blood-alcohol level was more than double the legal limit.
Staviski was released pending his appeal. He was also ordered to pay 270,000 leva (C$228,480) in compensation.
Staviski and Albena Denkova captured their second consecutive ice dancing title at the World Figure Skating Championships in March 2007.
The Bulgarians finished just ahead of Canadians Marie-France Dubreuil and Patrice Lauzon at the Tokyo competition.