Elon Musk is frequently called "Elon" Steve Jobs is never called "Jobs" Bill Gates is rarely if ever called "Gates"

You're trying to make a point out of nothing. Some names are simply more prone to be called using the first name, the last name only, or both, because it might just "sound" better or be sufficiently recognizable. Of course no one would call Steve Jobs "teve" since it's such a common name. "Marissa" and "Elon" are more rare and directly identify the people they refer to