Can you Hide your username in 8.1?

Hello all,

I just got a hold of a laptop thats using 8.1. It acutally came with it, but I'm viewing that as a good thing, so I can get some experience with this OS. My questions is a simple one, is there any way to hid either your last name, or your username when logging into 8.1?

I'm not a big fan of my last name being displayed when I lock my computer, or log into it. I don't mind having on my microsoft account, I'd just rather it only show my first name.