To change your Display Name:
You can use nickname generators, for example, the Randstuff program:
Roblox Username Generator
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On Roblox, you can change your account's username in the account settings. It costs Robux to make this change. However your Display Name is a free option to change how your name appears in an experience or game.
Log into your account (If you can't log in, try these steps for recovering your password .)
A list of previous usernames can be found on the Account Settings and Profile pages, along with People search. You can change back to a previous username, using the above method, which also costs Robux.
Display names replace player’s username above their character’s head in games, in the chat on games that have display names enabled and of course on the leaderboard. You can also do a “display name” search to find a profile.
Open Roblox , log in to your account, and tap on the three dots button.
Prior to starting to edit your in-game nickname, you should be aware of the basic prerequisites for this action and its cost.
You are able to do this by just joining the official get site, or if running Windows 10, you can get access to the settings from the official game platform app.