Using vanity url we can request page using different url. Vanity ur l is present under Page properties --> Basic Tab. We can also write custom script or use groovy script to add vanity url property to jcr:content automatically to multiple pages by reading the existing path and converting to small letters.
You can explore the Alias feature in AEM to satisfy your use-case. For instance, if you have a page /content/we-retail/TEST.html to be changed to /content/we-retail/test.html, you can follow below steps to achieve the same.
1) Go to /editor.html/content/we-retail/TEST.html
2) Open Page properties and go to Advanced Tab
3) Declare an Alias for this page by giving it an value of "test".
Now you'll be able to hit the page /content/we-retail/TEST.html as well as /content/we-retail/test.html.
Try running groovy scripts on the AEM project, it's easy to setup and easy to execute. I have implement something similar where I had to update the title of the page. Let me know if you need any help in creating groovy scripts for the mentioned automation. You can also refer Groovy Scripts on AEM Content