vSwitch0 is a standand naming convention for standard virtual switches. Only way to rename it is to modify the esx.conf file, then reboot the host to make the change effective. But this is not supported, and if host is managed via Auto Deploy (assuming this is a possibility since you're posting to ESXi 5 discussions), the changes will be gone after rebooting the host anyhow (unless if host profile is updated as well to support changes made...)
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