There is no API to accomplish renaming a domain (or system) using virsh. The well known graphical tool "virt-manager" (or "Virtual Machine Manager") on Red Hat Enterprise Linux therefore also does not offer the possibility to rename a domain.
In order to do that, you have to stop the virtual machine and edit the XML file as follows:
Edit the name between the name tags at the beginning of the XML file.# virsh dumpxml machine.example.com > machine.xml # vi machine.xml
When completed, remove the domain and define it again:
# virsh undefine machine.example.com # virsh define machine.xml
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