In professional sports has a player ever had a jersey with number "0"?

Yes, before 1973 when the rules chsanged

Robert Parish, of the Boston Celtics, was number 00.

One of greats from when I was a kid. He was on the team with Larry Bird, and Kevin McHale.

Do you have a search engine?

https://www.ranker.com/list/best-athletes-who-wore-0/ranker-sports

Jim Otto, Center for the Oakland Raiders, was “00”.

Relief pitcher Adam Ottavino has worn number 0 throughout his career. His last name begins and ends in “O,” so the jersey’s an amusing touch.