How to Change Nintendo Account Nickname
Steps for updating the nickname for a Nintendo Account.
What to do
Go to the Nintendo Account website and sign in to your Nintendo Account.
When signed in, you can update your nickname, or, if you are the admin in a family group, you can update the nickname for any supervised accounts in the family group.
Select User Information.
In the “Profile” section, select Change.
In the “Nickname” field, enter the desired nickname.
Select Save changes to confirm the change.
Select Family Group.
Select the supervised account with the nickname you wish to change.
Select User Information.
In the “Profile” section, select Change.
In the “Nickname” field, enter the desired nickname.
Select Save changes to confirm the change.