Hi, my name is Unknown Subject, and I'm an alcoholic

found on Reddit

So it's not really anonymous, even if you are just giving your first name - or even if you're giving a false name, it's still technically pseudonymous. That being said, in practice anonymity doesn't have to be entirely binary - something can be relatively anonymous and still give you many of the benefits of anonymity. For example one might feel anonymous in a crowd, even if everyone in the crowd is known.