Changing the Valheim server name is very easy.
Log in to our game panel.
And follow these steps:
Step 1: Click on the "Commandline Manger" button in menu.
Step 2: Click the selected option on the "Default" command line.
Step 5: Click on Apply button and save the changes.
Step 6: After it's saved, if the command line you just edited isn't selected, click on Select and activate it.
Step 7: Reboot the server to apply changes.
If you need help, submit a ticket here, we are here to help!