something like this should do (fill in your servers command):
on !*:nick: {
if ($notify(nickname-service).ison == $true) && ($newnick == nickname1) || ($newnick == nickname2) { /server-specific-kill/ghost-command }
OR
if ($notify(nickname-service).ison == $true) && ($newnick isin %nicknames-I-own) { /server-specific-kill/ghost-command }
}
OR
on *:notify: {
if ($notify(nickname-service).ison == $true) && ($nick != $me) && ($nick == nickname1) || ($nick == nickname2) { /server-specific-kill/ghost-command }
OR
if ($notify(nickname-service).ison == $true) && ($nick != $me) && ($nick isin %nicknames-I-own) { /server-specific-kill/ghost-command }
}
That's a start. I used to have an ON NICK event do just this, but changed it in favor of on notify to keep things simple since if I can see the nickname change, Im gonna see it on notify lsit AND if I see it on notify lsit, it wont matter if I see the actual nbick change. The above examples are simply that, examples but they shoudl give you some ideas