WordPress Security – Never leave your administrative username as your display name.
When you set up your user account to be able to log into your WordPress site, the username you choose is automatically set as the name that will be displayed publicly when you create posts/pages.
To change what gets displayed to your website-viewing audience, hover over Users and choose Your Profile. Find the field Nickname and change it to something other than your username.
Below Nickname, you will see Display name publicly as. Click the down arrow to see your choices.
You can either fill in the First Name and Last Name fields and use a combination of those two fields, or you can choose to use the new display name you have just entered. Consider making your Nickname something like Subscriber or even Author if you decide not to use a combination of your first and last name.