In ARD run a unix task on the computers you want to rename. Select the bubble for the user and say root. The command you want to run is all that is in the block quote below.

#!/bin/bash

/usr/bin/osascript << EOF 
property compName : ""

repeat while compName is ""
    tell application "Finder"
        activate
        display dialog "What should this computer be named:" default answer compName
        set compName to text returned of result
    end tell
end repeat

try
    do shell script "hostname " & quoted form of compName 
on error errorMsg number errorNum
    display alert "Error " & errorNum message errorMsg buttons "Cancel" default button 1
end try
EOF

name=$(hostname)
scutil --set ComputerName "${name}"
scutil --set LocalHostName "${name}"

1. Open the Mac App Store and go to the Updates tab as if you were going to install a software update
2. Right-Click (or Control+Click) on the large OS X El Capitan banner and choose “Hide Update”
3. Exit the App Store

curl https://admdownload.adobe.com/bin/live/AdobeReader_11_en_a_install.dmg > AdobeReader.dmg
hdiutil attach AdobeReader.dmg
/Volumes/Adobe\ Reader\ Installer/Install\ Adobe\ Reader.app/Contents/MacOS/Install\ Adobe\ Reader
hdiutil detach /Volumes/Adobe\ Reader\ Installer/
killall “Google Chrome”
killall "Safari"
killall "firefox"
rm -rf AdobeReader.dmg

curl https://dl.google.com/chrome/mac/stable/GGRO/googlechrome.dmg > Chrome.dmg
hdiutil attach ./Chrome.dmg
killall "Google Chrome"
cp -rf /Volumes/Google\ Chrome/Google\ Chrome.app /Applications/
hdiutil detach /Volumes/Google\ Chrome/
rm -rf Chrome.dmg

curl http://releases.mozilla.org/pub/mozilla ... 41.0.2.dmg[/url] > Firefox.dmg
hdiutil attach ./Firefox.dmg
killall "firefox"
cp -rf /Volumes/Firefox/Firefox.app /Applications/
hdiutil detach /Volumes/Firefox/
rm -rf Firefox.dmg