You can set your own name, e.g Libertas.
Initially your user name & name are the same, e.g. @Libertas -- but you can change your Name (remove the '@').
For example, there's a dude there with the following:
Name - Uncle Sam’s Misguided Children
User Name - @UncleSamsMisguidedChildren
He could, if desired, change the Name to "Uncle Sam’s Misguided Kids" -- his User Name would remain the same as it's part of the email used to sign-up.