Automating syncing of image names across a website?

Hi, really new to this so please bear with me.

I have a website with about 1000 images which over the years have been badly named.

1. Is there software, plugins, methods etc to somehow automatically update all instances of an images file name in the html across multiple pages when the file name is changed in the root folder?
   
   
2. Also is there a way to automate the process if the images folder structure is changed?
   

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