And that has taken him by surprise.
"It's not a big deal," Stanton said. "It's my real name. I've had it on my nameplate always."
His full name is Giancarlo Cruz-Michael Stanton, but he has gone by Mike for most of his life. Now, the Miami Marlins right fielder has decided to be announced during games and referred to as Giancarlo.
However, Stanton said he will still autograph baseballs as Mike instead of Giancarlo.
Stanton went to Twitter on Wednesday, changed his handle to @Giancarlo27_ and posted this message, "From now on, I'll be going by my real name..Giancarlo!. Not Metta world peace, not ochocinco. Just real, Just me!"
"I just wanted to make sure it's not like I think I'm cool now or that it's some random name that I switched it to," Stanton said of the tweet.
"But whatever, I can care less if you don't like it. If you like it, then cool, and I'll respond and talk to you. If you don't, that's my name and that's like me talking mess about your name."