Starting from January 1, 2020, Facebook has enforced a policy that requires users to display their real names on their profiles. This means that you are not able to have a single name on your Facebook profile. However, you can still use variations and additional names in the "Alternate Name" field on your profile, allowing you to show a preferred name or nickname alongside your real name. Facebook's policy aims to create a more transparent and authentic community. Keep in mind that it's crucial to follow their guidelines to avoid any account-related issues. If you have any specific concerns or questions regarding your Facebook profile, feel free to provide more details, and I'll do my best to assist you further.