There are multitudes of misnamed files around the wiki. It's bothersome, but the solution is to just label the image correctly on published pages. Only editors or the extra curious see filenames. Example: "ITEMNAME-Equipped" is just not accurate. But we use it because "fixing" it would be an unspeakably large amount of work for very little gain.

Moving files is evidently a difficult process. It can be done, and has been, but it takes time and usually isn't worth it, and frequently fails for unknown reasons. We move files to attempt to retain history. If it's undoable, just provide as much information as possible. Only admins can move files.

If you feel that the image itself is out of date and/or could be better, upload one. To a better filename, yes, but one that is also consistent with established patterns on the wiki, however flawed they may technically be.

Fixing the label below a file (or next to it) is the best, safest, fastest option in most cases, which you've done, so that's good.