Which famous e-commerce platform's name was inspired by a legendary river from Greek mythology that was said to flow through the underworld?

Throughout history, brands have borrowed power, recognition, and symbolism from mythology and folklore to create memorable identities. From Nike's winged goddess of victory to Starbucks' siren, mythological references permeate modern branding. Test your knowledge about how ancient deities and legendary figures have influenced some of the world's most recognizable brands and their marketing strategies.

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Styx (payment processing system)
Amazon (named after the river in Greek mythology, not just the South American river)
Lethe (cloud storage service)
Acheron (online marketplace)