Tiffany,
I find that happening to me too. And, like Melissa, I have a signature that works either way, and also have trouble remembering which name to use at the end of an email.
I know it's going to happen soon that not only do I turn around, but that I also answer. Still, my names sound similar enough that I could blame that.
Don't worry, hon, you are not the lone air-head...there are lots of us here. (Did I just have a "blonde" moment?)
Giggles.......Laurie