Which major language learning app's name derives from the Spanish phrase for 'I give' (yo doy) and was specifically chosen for its linguistic implications of 'giving language' to users?

Linguists often study how successful brands craft their names using specific language principles. Some of the world's most recognizable brand names were carefully engineered using linguistic techniques to create memorable, pleasant-sounding, and psychologically appealing words. This trivia tests your knowledge about the linguistic origins behind famous brand names in the language industry itself.

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Duolingo
Babbel
Rosetta Stone
Memrise