It must pass Roblox's text filter to make sure that it meets the Community Rules (explained below). Players can’t match usernames belonging to high-profile players like zlib, Azarth, etc.

To get or change a Roblox Display Name, you should first log in to your Account Info page under Settings, then select the edit button next to the Display Name entry above your Username.

ROBLOX allows you to change this username, as well as your Display Name. It’s important to note that there are different rules and applications of both Usernames and Display Names.