Willie Mays was a legendary 20th century baseball player from Earth.
In 1954, Eli Underwood listened to a baseball game where Willie Mays tied Joe Adcock for home runs at Ebbets Field. (DS9 novel: Unity)
In 2373, Jake Sisko and Nog went to great effort to acquire a mint-condition 1951 Willie Mays rookie baseball card in an auction for Jake's father. (DS9 episode: "In the Cards", DS9 - Worlds of Star Trek: Deep Space Nine novel: Ferenginar: Satisfaction is Not Guaranteed)
Nanietta Bacco, a great baseball fan, would often tell staff members stories about Mays and other famed players. (ST novel: Articles of the Federation)