What Would Your Pen Name Be?

I've been thinking some about pen names.  Lots of famous writers used pen names during their careers.  Some did it because they were female and times were different back then, so they used a male pen name.  Others use pen names because they don't want to associate their other writings with whatever it is their penning under a fake name.  Whatever the reason, pen names can have a lot of meaning and sometimes a lot of thought has went into choosing them.  If you had a pen name, what would it be?