webvitaly

<ul>
<li><a href="http://web-profile.net/wordpress/plugins/" title="WordPress Pro plugins" rel="nofollow ugc">WordPress Pro plugins</a></li>
<li><a href="http://web-profile.net/wordpress/plugins/filenames-to-latin/" title="Plugin page" rel="nofollow ugc">Filenames to latin</a></li>
<li><a href="http://web-profile.net/donate/" title="Support the development" rel="nofollow ugc">Donate</a></li>
<li><a href="https://github.com/webvitalii/filenames-to-latin" title="Fork" rel="nofollow ugc">GitHub</a></li>
</ul>
Plugin sanitizes Cyrillic (Ukrainian, Russian, Belorussian), German, French, Polish, Spanish, Hungarian, Czech, Slovak, Greek, Swedish, Finnish, Latvian, Estonian, Mongolian, Bosnian, Croatian, Serbian, Montenegrin and other filenames to latin characters during upload. 
Plugin converts filenames to lowercase automatically.
<h4>List of sanitizing letters:</h4>
а б в г д е ж з и й к л м н о п р с т у ф х ц ч ш щ ь ю я ґ є і ї ё ы ъ э ў ą ć ę ł ń ó ś ź ż à á â ã ä å æ ç è é ê ë ì í î ï ð ñ ò ó ô õ ö × ø ù ú û ü ý þ ÿ ß ő ű ě š č ř ž ý á é ď ť ň ú ů α β γ δ ε ζ η θ ι κ λ μ ν ξ ο π ρ σ τ υ φ χ ψ ω ά έ ή ί ό ύ ώ ς ΐ ϊ ϋ ΰ đ.
<h4>Useful:</h4>
<ul>
<li><a href="https://wordpress.org/plugins/page-list/" title="list of pages with shortcodes" rel="ugc">“Page-list” – show list of pages with shortcodes</a></li>
<li><a href="https://wordpress.org/plugins/iframe/" title="embed content" rel="ugc">“Iframe” – embed content</a></li>
<li><a href="http://web-profile.net/wordpress/plugins/" title="WordPress Pro plugins" rel="nofollow ugc">WordPress Pro plugins</a></li>
</ul>

Filenames to latin

Sanitize filenames to latin during upload.

Bradley Dalina

File Media Renamer is a WordPress plugin that allows to rename uploaded files already and change their postname or slug-url. 
This plugin simply adds two fields in the wordpress media frame, namely the filename field and the postname field where in you can easily rename the files. As per current wordpress versions does not support or does not have a feature of renaming uploaded files so you either need to delete the file and re-upload it again or simply install this plugin and rename them in the media frame screen.
“This plugin is limited with its available settings. Before writing a reviews, please mention that you read the whole description and clearly understand the limit and usage of the plugin.”

File Media Renamer

Very Useful Plugin!

This plugin allows you rename uploaded files available in wordpress media and change the postname or slug name.

Filenames to latin vs File Media Renamer