How do I change the name shown in the "From" line?

[Brianna]

Awhile back, I didn't want my real name in any of my email account information, so I used a fake name, but I would like to change that to my real name. I have tried changing every setting in my account from my fake name, to my real one, but when I send someone a message, it still says my fake name in the "From" line. How do I change this????