You have the old name and new name in two columns in a file. I will call the file "names.txt". Here is the script that will rename all of them in a batch.
var string names ; cat "names.txt" > $names
while ($names <> "")
var str line ; lex "1" $names > $line
var str oldname, newname ; wex "1" $line > $oldname ; wex "1" $line > $newname
system rename ("\""+$oldname+"\"") ("\""+$newname+"\"")
This script is in biterscripting. You can download it free from http://www.biterscripting.com . It installs in minutes.
Save the script in file C:\Scripts\rename.txt. Start biterscripting. Enter the following command.
It will rename all the files one by one. Then export them.
Email me if you need more help.