For anyone who regrets the name they choose 12 years ago a light is on the horizon, soon you will be able to change your psn name,
The first change is free, then €9.99/£7.99. or €4.99/£3.99 for For Ps+ subscribers.
This feature will be in beta for the PlayStation Preview Program, if you've previously been in a firmware beta then you may receive an invite.
There may be trouble with some older games and you can have your old name linked to your new name, you can also revert the change if needed.