I am not sure that I have come across any such command or procedure to change the cluster name after the installation.Oracle only has documented the change of the SCAN name in 11.2 RAC if I am correct. To change the cluster name, you would need to reinstall with the new name. May be I am missing something too so wait for others to reply as well.
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There is no official Way to change Oracle Cluster Name , uninstalling/reinstalling Like Aman Said.
Can we uninstall and re-install only grid infra structure without disturbing DB software?
After re-installing the grid infra structure, how can we register the existing ASM disk groups in the ASM instance?