How to Change the Display Name of a WordPress User Account?
You can change the display name of your WordPress account which shows on a WordPress post or comments without changing your WordPress username.
1. log in to your WordPress admin dashboard.
2. Under the dashboard menu, hover your mouse over "Users" and then click on "Your Profile".
3. Locate Nickname and enter your new name.
4. In the option Display name publicly as, choose your newly added nickname from the drop-down menu.