you may use this method,
first make the filename list and save to a text file, e.g. dir/b >list.txt
import to excel, and create 3 column with such data below, e.g.
ren 1 abcdef
ren 2 123456
ren 3 fjlkjlkdjs
and so on.
save as unicode text (*.txt) file into the target folder, rename the extension to .bat to create the batch file and run it.