Many Smart-TV's, Home Theater Systems and Media Players require matching subtitle and video filenames. For users having many movies with various subtitles, 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 for seeing the old and new filenames before starting the actual rename operation. In this way, you can avoid messing up all the subtitle filenames.
You can choose from multiple renaming methods that would work for you:
Category: Audio & Multimedia 
Video Tools
Supports: 
Windows 10/8.1/8/7/Vista/XP (32-bit and 64-bit)
Language: English
License: Freeware — no nags, no ads, fully functional
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