In the Google Home app, select the camera, then click on the Settings icon in the upper right corner (the gear), then select the Name, and when "Device name" displays, change the name and click SAVE.
I apologize for my late response and thank you for all of your patience while waiting for a reply. I can definitely understand how frustrating your situation must be, but I wanted to make sure that your issue was addressed. Do you still need help with this issue? I know that there's been a delay in response since you posted.
Please let me know if you need further assistance.