Most cameras use /cgi-bin/video.jpg or /webcam.html. Change your web server configuration. If you must expose a camera, put it behind a reverse proxy with a random string: /8d3f9h2a1z/camera.
The search string "evocam inurl webcam html free" is a specialized Google search operator combination used to find publicly accessible webcam streams generated by Evocam software.
If you own an EVOcam and want to prevent it from appearing in these searches:
Use a tool like curl from an external network (or ask a friend) to request your external IP on the port you are using. If you see webcam.html without a password, you are vulnerable.