If you would like to change your in-game name, you can do so by changing your platform name.
Keep in mind that Psyonix Support is not able to manually change or modify platform names. If you have difficulties with changing your platform name, please contact your platform directly.
Follow the steps below to get started:
Epic Games
Your email must be verified before you can change your display name. For more info, check out How Do I Verify My Email Address?
Go to your Account Info page
Find the Display Name box
Click on the Pencil icon
Type in your new Display Name
Click the Confirm button
Scroll to the bottom of the page
Click the Save Changes button
For more info, check out: How to Change Your Epic Games Display Name.
PlayStation
Go to the Account Management page
Sign in with your PlayStation Account
Select your PSN Profile
Click the Edit button next to your current online ID
Type in your new Online ID
Follow the on-screen instructions
For more info, check out: How to Change Your PlayStation Network Online ID.
Xbox
Go to the Choose Your New Gamertag
Sign in to your account
Enter the new Gamertag
Click the Check Availability button
Click the Claim it button
For more info, check out: How to Change Your Xbox Gamertag.
Steam
Open the Steam Launcher
Hover your mouse over your Profile Name at the top of the browser
Select Profile
Click on the Edit Profile button
Find the Profile Name box
Type in your new Profile Name
Scroll to the bottom of the page
Click the Save button
For more info, check out: SteamID, Steam Account Names, Merging Accounts and Deleting Accounts.
Nintendo Switch
Go to the Nintendo Account website
Sign in to your Nintendo Account
Find the Profile box
Click the Edit button
Type in your new Nickname
Click the Save Changes button
For more info, check out: How to Adjust Nintendo Account Profile (Country, Email, etc.)