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According to wikipedia Mishka. Submitted by Anonymous (not verified) on Sat, 2012-07-07 18:19. According to wikipedia Mishka means Little Fly in Russian and was the name of one of the dogs that went into space before humans were send. http://en.wikipedia.org/wiki/Mushka#Pchyolka_and_Mushka reply
Another group of words that Sokolsky indicates as making up part of the modern Russian lexicon is of Eastern Slavic (Old Russian) origin. These words are common to the Russian, Byelorussian, and Ukrainian languages of the present day, but are absent from the Western and Southern groups of Slavic languages. These words include family relationships, animals, colors, and time reference words such as today, after, and now (88).