Which major language learning platform changed its name after discovering their original brand name was considered offensive in certain European languages?

In the world of language and linguistics, brand recognition often hinges on clever wordplay, linguistic innovation, and cultural sensitivity. The most successful language-focused companies understand how their brand names and identities resonate across different cultures and language communities. This poll tests your knowledge about a fascinating linguistic branding phenomenon that changed an entire industry's approach to global markets.

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Duolingo (formerly 'LingoSpot')
Babbel (formerly 'SpeakEasy')
Busuu (formerly 'Voxio')
Memrise (formerly 'WordBrain')