How much does your name, given or chosen, affect your behaviour?

And here, on fluther, your chosen nickname?

A random sampling of nicknames here say a lot to me – but perhaps have a different meaning entirely to the person who chose it. I won’t name them, but if you go over the nicknames, do you get a first (or second and third) impression based on the name they have chosen? And is that because of the affect the name has on you based on your experience, or because they have chosen it for themselves and that surprises/amuses you?