Which linguistic principle was specifically cited by Amazon when naming its voice assistant 'Alexa'?

In the world of retail, language plays a crucial role in brand identity and consumer perception. Linguistic choices in slogans, brand names, and marketing materials can significantly impact a company's success. This trivia question explores how language science has influenced one of the most recognizable retail innovations of recent years, highlighting the intersection of linguistics and consumer technology.

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The 'x' sound is rare in English, making it more distinctive and easier for voice recognition technology to identify
It was named after the Library of Alexandria, symbolizing knowledge and referencing the company's origins as a bookstore
The name tested highest for perceived intelligence and trustworthiness in consumer focus groups
It follows the linguistic pattern of successful assistant names ending with 'a' (Siri, Cortana) for perceived femininity