The Black Swan is a very popular logo. Quite a number of companies around the world, use it. Among the better known ones are:
Black Swan Records
Black Swan State Theatre Company
Black Swan Solar
Black Swan Brand Cheasapeak Bay Oyster
Black Swan Cooperage
Black Swan Real Estate
Black Swan Press
Black Swan Dynamics
Black Swan Development
Black Swan Anatomy
Black Swan Winery
Black Swan Financial
Black Swan Inn