Snapchat question

Sorry I didnt know where to post this. I j ust had someone add me. But it only has their user name and it says their in my contacts? I don't talk to a lot of people and don't have like any contacts besides family and close friends. I can't see what their real name is or number so I have no idea who it is? Is there a way I can find out? I rather not add them and ask.