FontRenamer is free and renames truetype font files (*.ttf) to the real name of the typefaces.

Simply select a folder of font files and click Rename button. »Arial bold italic.ttf« instead of »arialbi.ttf« or »Brush Script.ttf« instead of »brushscn.ttf«.

That software doesn't record activities, doesn't require runtimes, doesn't require installation, doesn't write to the registry, doesn't modify files outside of its own directories, isn't adware.