Which mythological figure inspired the logo and name of one of the world's largest coffee chains?

Throughout history, brands have drawn inspiration from mythology and folklore to create powerful marketing identities. From ancient symbols to legendary creatures, mythological elements have shaped some of the world's most recognizable brand mascots and logos. This trivia tests your knowledge about the intersection of mythology and modern retail branding strategies. Can you identify which mythological figures have successfully transitioned into the commercial world?

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Siren (from Greek mythology)
Phoenix (from Egyptian mythology)
Medusa (from Greek mythology)
Valkyrie (from Norse mythology)