aunque sea solo cambiar una letra por otra?
No. Por el momento no hay manera de cambiarse el nombre. 
As Yhoal had mentioned, at this time there is no way to change your name. We would be happy to collect your suggestion and share it with the team, though!
As this question has been answered, I will go ahead and close the thread.
Please don’t hesitate to reach out if you have any other questions or concerns!