Which linguistic phenomenon was deliberately employed in the naming of the language learning app Duolingo?

The language of marketing shapes how we perceive products. From clever slogans to carefully chosen brand names, linguistics plays a crucial role in product advertising. This poll explores how language and linguistic principles have been strategically employed in famous marketing campaigns that transformed ordinary products into household names. Test your knowledge about the intersection of linguistics and product marketing!

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Portmanteau (blending 'duo' meaning 'two' and 'lingo' meaning 'language')
Onomatopoeia (the name mimics the sound of a bird teaching language)
Backronym (each letter represents a language learning principle)
Reduplication (repeating syllables like 'duo-duo' simplified to 'duolingo')