Which linguistic naming technique did the language learning app Duolingo use that specifically leverages sound symbolism to convey its purpose?

Product naming is a fascinating intersection of linguistics and marketing strategy. Companies invest millions in developing names that are memorable, meaningful, and effective across cultures. This poll explores how linguistic principles influence product branding decisions and what techniques have proven most successful in the language products industry. Test your knowledge of how language shapes product identity in the global marketplace!

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Reduplication (repeating syllables with vowel alteration 'duo-lingo') to suggest repetition in learning
Portmanteau blending (combining 'dual' and 'linguistics') without any sound symbolic elements
Back-formation (creating 'lingo' from 'linguistics' and adding 'duo') as a grammatical technique
Onomatopoeia (the 'duo' mimics the sound of conversation between two people)