Well if I'm thinking what you're thinking (a plugin that ONLY you can use and anyone who changes the name to avoid being caught with taking it), you could do something like create a FCVAR_SERVER CVAR so that it can be obtained by checking if that cvar is running, then somehow find the name of the plugin by parsing the data returned by maybe an "amxx cvars" like call.
There is probably a better, more effective and less kryptic way, but that's just my two cents :-).
Slmclarengt
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But we don’t beat the Reaper by living longer. We beat the Reaper by living well. -Dr. Randy Pausch, R.I.P.