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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}"