Possible Clues:

• Former Soviet leader Andropov
• Zhivago's first name
• __ Gagarin, first human in outer space
• Doctor Zhivago, in 'Doctor Zhivago'
• -- Gagarin, cosmonaut
• First name in cosmonautics
• First name in orbiting
• He orbited Earth 314 days before John
• First first name in space
• Chess master Averbakh