Serious observation. Why do people (here) feel they can refer to Elon Musk as just 'Elon' - using his first name, that is? It seems overly familiar, and impoli

Serious observation. Why do people (here) feel they can refer to Elon Musk as just 'Elon' - using his first name, that is? It seems overly familiar, and impolite to me. Being from the UK, I would refer to him as 'Musk' in both writing and speech, and perhaps even as 'Mr. Musk' in formal writing. Is it a SV, or even just American, thing perhaps? It seems to depend on the person, though. For instance, the Google founders are often referred to as 'Larry and Sergey' rather than 'Page and Brin' here, although 'Eric' was rarely used, his full name seeming to be preferred instead. Similarly, nobody would talk about 'Tim' from Apple, rather 'Cook' or 'Tim Cook', although the nickname 'Jony' is often used instead of 'Ive' or 'Jonathan Ive', and 'Jobs' more often than 'Steve' although that coulkd have been due to the possible confusion over the two founders. In general, it seems that certain engineering icons and luminaries are granted this informal status. In a similar way to actual rock stars, perhaps because the referers feel the informality gives a sense of familiarity that brings them closer to their idols?