the OP is asking if Courteny Cox is more famous than Bruce Springsteen but s/he (the OP) spells it Courtney. It isn’t for several posts that this is picked up, and is used as evidence of her status as otherwise people would know how to spell her name. For the record until that post I also thought it was “Courtney”.
What other celebrities consistently get their name misspelled, and any nmore famous than Cox? For this purpose I would exclude anybody whose Latin alphabet name is actually a transcription of a name in Hindi, Chinese, Japanese, Arabic etc.
Gordon Ramsay is somewhere in the running - there are numerous magazine and news articles misspelling his surname as ‘Ramsey’ - even people claiming that it’s a Mandela effect thing.
Ah, now I get it. But I think this is an unnecessary limitation. As a matter of fact, all suggestions so far are surnames, only your example was a given name.
Arnold Shwartzenegger is pretty famous, and I’m sure his name is routinely misspelled. I didn’t look it up and I have no idea if I spelled it correctly or not.
ETA:I at first missed the addendum that the OP was looking more for given names.