Yarpivo' stands for 'Beer of Yaroslavl' ('Yar' - short for Yaroslavl, 'pivo' - beer) Yaroslavl is the city in the mid Russia.(Thanks Mikhail)
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Yar is a part of "Yaroslavl", the name of the city where the beer is being produced (280 km north-east of Moscow). "Pivo" means "beer".
The name of the beer means Yar(oslavskoye)pivo, from Yaroslavl (old russian town) and pivo - beer in russian language Tell us more