for 200 APs, maybe just easier to roll your own.
Assuming you have a text file that has the mac_addr and the desired new name "comma separated", e.g.
00:11:22:33:44:55,new_name_123
00:11:22:66:77:88,new_name_456
then using using a linux box (or install cygwin on windows), assuming the text file is named "the_text_file.txt", then run the following
for i in `cat the_text_file.txt`; do
mac=`echo $i | cut -d',' -f1`
new_name=`echo $i | cut -d',' -f2`
echo "whitelist-db cpsec modify mac-address $mac ap-name $new_name"
# Uncomment the next line if you want to reboot them
# echo "apboot wired-mac $mac"
done
now copy paste the resultant output to the aruba CLI, test it with just copy/paste the first few lines to make sure it does what you expect.