Igor is very popular slavian name - apparently it has Scandinavian origins though.
From Wiki:
Igor (Russian: Игорь [ˈiɡərʲ]; Ukrainian: Ігор (Ihor) [ˈiɦɔr]; Belarusian: Ігар (Ihar) [ˈiɣar]) is a common given Slavic name derived from the Norse name Ingvar, that was brought to ancient Rus' by the Norse Varangians, in the form Ingvar or Yngvar. Igor (son of the Varangian chief Rurik) was left as a child with Rurik's distant relative (supposedly) first Grand Prince of Kiev - Oleg and later, after the death of Oleg replaced him on Kiev's throne.