A Roblox Display Name means that as well as customizing the appearance of your avatar, you can also determine what name is seen by other players and will appear in different areas of the game too ...

How Can I Change My ROBLOX Display Name? You can change your Display Name for free, once every seven days. This is how other players see you in-game and isn’t unique to one player.

Roblox players always want to look their best by putting the rarest or best-looking items on their avatar.