Which linguistic phenomenon did the retail giant Apple deliberately employ when naming their wireless earbuds 'AirPods'?

In the world of retail and product marketing, language choices can make or break a brand's success. Linguistic principles are carefully applied to create memorable product names that resonate with consumers. This trivia tests your knowledge about how language science influences product development and marketing strategies in major retail operations.

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Portmanteau (blending 'air' with 'pods' to create a new compound word)
Onomatopoeia (using a word that phonetically imitates the sound it describes)
Backformation (creating a new word by removing actual or supposed affixes)
Eponym (naming a product after a person, like Tesla)