Many Smart-TV's, Home Theater Systems and Media Players require matching subtitle and video filenames. For users having many movies or series with lots of subtitle files, it is a hard work to rename all the subtitle filenames manually. This is where Vovsoft Subtitle Renamer comes in. You can easily rename filenames of closed captions (CC) according to video filenames by selecting the video directory and clicking the "Start" button. The software will rename all the subtitle files.
The software includes "Preview" button to display old and new filenames before starting the actual rename operation. In this way, you can avoid messing up all your subtitle filenames.
You can choose from multiple renaming methods that would work for you:
Category: Audio & Multimedia 
Video Tools
Supports: 
Windows 11, Windows 10, Windows 8/8.1, Windows 7, Windows Vista, Windows XP (32-bit & 64-bit)
Language: English
License: Freeware — no nags, no ads, fully functional
Vovsoft Video Software List Difference between Installer and Portable Editions Vovsoft Portable Software List Subtitle Renamer Feature Requests
Simple its work as portable app, just copy subtitleren.exe to USB or other hard disk and run perfect. I love it, thank to you.
— Aloanaspiky
Installer
Portable
Open Multiple Files 
Rename Multiple Files 
Subtitle Translator