[Someone]

Player names are trademarked the same way Louis Vuitton is trademarked as a brand.

For famous players, that may even mean they can introduce brand names that otherwise would be ruled confusing. You can’t start selling Louis Vuiton bags, but Messi clothing and shoes won a legal battle against the older Massi brand (https://www.bbc.com/news/business-54193973)

[Retric]

Trademark protects from confusion in the marketplace not all use. Pepsi can’t successfully sue CNN because someone being interviewed was drinking a soda.

That said, using the names would definitely get you sued but at 250m/year a court case could be worth it.