That outputs files with only region name, but i want to leave original file name too.
For example i have a bunch of mp3 files named vm5587, vm5588, vm5589 etc, i make and name different regions over diffrent file, so after batch render files names be like vm5587first , vm5588second, vm5589third etc
Then you would have to pull the original event name out of the event on the timeline and add it on the line I specified. That's much more complex, though. The easiest way would be to include the event name in the region name when you create the region.