Can I create my own display name?

You cannot create your own display name. Instead, on the Settings: Public Profile page (must be signed in) you will be presented with several options and may select one which will show a version of your real name as your display name on your profile page and any activity you may take across (e.g., commenting on an article, uploading a photo, etc.). Below you can see a member who has selected to show his first name and the initial of his last name.

See How do I change my display name? for additional information.
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