Is it possible to change the name of a Storefront Server that already belongs to a Server Group?
When a Storefront Server belongs to an SF Server Group, it is not possible to change its name and, it is not recommended to do it even if the Storefront Server does not belong to any SF Server Group due to possible technical issues from Active Directory and Citrix.
It would be better to create a new Storefront Server with the name that you need and add it to the SF Server Group.
Additional Information
All component versions supported by the Product Lifecycle Support per Vendor: