I believe they prefer "Trekker"
but everyone calls them Trekkies anyway.
Or spacks.
( Malchickles, Sun 10 Oct 2004, 18:53, archived)

Spackkers - sums them up nicely
especially when they try so hard to learn Klingon (It's a made up language for crying out loud)
( maiden has nothing interesting to say... You still here?, Sun 10 Oct 2004, 18:55, archived)