6. Click New Query in SQL Server Management Studio and type select @@servername to verify everything is correct and you have successfully changed the sql server name.

Open Run by Win + R, type Services.msc, and click on Ok. Now, look for the SQL Server (instance name or db name) service, right-click on it, and click on Properties from the context menu.

Now, enter your SQL Server's name and choose the authentication type that you want to use. If necessary, enter the credentials to be used for SQL Server authentication.