Could you please help us for below query.
Do you know how to rename a standard vSwitch in vSphere 6.5
es, that's possible. But you won't able to perform this task via Web Client. You need to edit esx.conf fine on each esxi host replacing name for standard switch.
/net/vswitch/child/name = “vSwitch-XXX“
After making changes reboot host to reflect changes. Also you need to do this on each host of cluster if vmotion port is on standard switch as this isn't going to work if vSwitch name is different on host to host