Change the Name of your Modern Team Site
When creating a modern team site in SharePoint you will have the option to enter the name you choose for the site. However, if you need to change the name of the site later, you can accomplish this with the steps below.
Navigate to the homepage of the site you wish to change the name of, and select the cogwheel in the top right corner.
When the settings panel opens select Site Information.
In the Edit Site Information panel you can edit various details such as the site logo, site name, site description, privacy settings and hub association.
Edit the site name to your choosing and select Save and you have now changed the name to your SharePoint site.
*Please allow at most 24 hours for changes to take effect