John Godley

Enhances the WordPress media library by allowing you to rename the underlying media files. Any change to a media item’s title will result in the media filename also being changed.
See the screenshot for more details of where to rename media files.
Note that all thumbnails will also be renamed. If you are using a caching plugin, such as WP Super Cache, then you will need to clear your cache so that any references are updated. This plugin does not update existing direct links to files (links inside a WordPress gallery will change).

Rename Media

Rename underlying media files from the WordPress media management interface

Cellophile

Automatic File Renamer let you rename with prefix or suffix media’s name, and redirect attachment pages where you want (3 options). It let you to personalize text you want to add to your medias.
Features
<ul>
<li>Simple page with personnalization</li>
<li>Rename files and attachment pages during the upload.</li>
<li>Redirect attachment pages (the page that presents media only) to (1) the url file, (2) to the attached page (the page where the media appears) or (3) to a 404 error. </li>
<li>let you decide if you want to enable one or two of the options, with simple click.</li>
<li>Automatic File Rename is currently traduct in English, spanish and French.</li>
<li>For admins, choose which role can change the settings</li>
</ul>
Basic Usage
Once installed, the plugin will begin to rename all medias that will uploaded (and only them, all medias still in te library will not changed). 
By default, redirection is made to the url file, and the rename is included the name of the site.
You can modify prefix and suffix (nothing as value is possible), and change the redirection, or disable it if you prefer.
Contribute
Automatic File Rename is accessible on <a href="https://framagit.org/Cellophile/automatic-file-renamer/" rel="nofollow ugc">framagit</a>. Pull Requests welcome.

Automatic File Renamer

Automatic File Renamer let you rename with prefix or suffix media's name, and redirect attachment pages where you want (3 options).

Rename Media vs Automatic File Renamer