I rather just be called Beastie or thebeast. I think everyone else is happy calling me either of these 2 names as well!
But yeah obviously when new members come on you will just know them by their username and will take a bit of time to know their "real name" if they want to share it!
Sometimes I call UkTurtle, turtle or Ben. Zee, Zee or Greg. GypsyGoth, GyspyGoth or Claudia, Claude! I kind of call people by their name and username.. ummmm.