Kosoy

Kosoy, Kosoi or Cosoi (Косой meaning slanting, oblique, etc.) is a Russian masculine surname, its feminine counterpart is Kosaya. It may refer to
 * Feodosy Kosoy (fl. 1550s), Russian serf-monk
 * Stewart Kosoy (1950–2015), American video game designer
 * Vasily Kosoy (1421–1448), Grand Prince of Moscow
 * Vassian Patrikeyev (Vassian Kosoy), Russian ecclesiastic and political figure and writer