No two players can have the same Username, and as such, is completely unique. A Display Name is how other players will see you in-game. This feature appeared in 2021 and is available to all players ...

How to buy 1,000 Robux to change your username on Roblox Robux are the in-game currency of Roblox, and they may be used to buy in-game improvements and avatar accessories.

A Roblox player spent over $8,000 changing their username. The player renamed their account 802 times, revealing unusual spending habits.