This explains a lot of misspellings on envelopes I get through the mail, and it would be good to see this with your own name. It must be really sad if you’re Matthew mcconaughey and two thirds of the time your name is spelled wrongly in some way. Still, he’s doing ok
If your family immigrated somewhere there's a good chance the immigration official gave you your current family name spelling.
For me, my surname has about a dozen variations that arise, it seems, from mediaeval British spelling variants. If I tell people my name then they usually spell it according to the variant they've commonly seen, but more often than not they get it wrong.
I don't personally know any of the people in the study, but I've seen most of the names in writing before ... ScarJo just happens to have the same spelling as my friend with the same surname.
I'm not sure what any of it proves?
Also, spellcheck? That surely perverts the results.