Which linguistic technique did the creators of 'Google' use that has become common in tech product branding?

Language plays a crucial role in how products are perceived and remembered. In the competitive world of retail, linguistic elements in branding can make the difference between a product that fades into obscurity and one that becomes a household name. This poll tests your knowledge about how language science has influenced some of the most successful product naming and branding strategies in the market.

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Onomatopoeia (using a sound-based word)
Reduplication (repeating syllables like 'goo-goo')
Portmanteau (blending two existing words)
Back-formation (creating a new root word from an existing word)