Depending on the platform you play your game.
If you play on browser as you have a nickname you can always log in and change your profile name, if you play through Facebook then unfortunately there is not yet an existing option to change your name as it is linked to your account from Facebook which are using your real name.
Some accounts may be deleted as a result of GDPR, and any player who is not active for 3 years, the account will have the name removed but you can still raid the city as usual.
I hope this helps.
I'm new to the game and I would like to change my name please.
Hello look at that link, I'm sorry this in Spanish but you will understand
hola mirate ese enlace, siento que este en español pero lo entenderas
Can u delete me account? I would like to start again
Hello! Thanks for your question!
In case you decide to restore it, you will have to use the link sent in a letter to your e-mail. Good luck!