You can change the display name of your WordPress account, which shows on WordPress posts and comments.
Steps to change the WordPress User’s Display Name
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Log in to the WordPress dashboard.
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From the Dashboard menu, go to Users and click on Profile.

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Locate Nickname and enter your new name.

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From the Display name publicly as, choose your newly added nickname from the drop-down menu.

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Scroll down to the bottom of the page and click on Update Profile.