We use "nicknames" - LOL - but they are generally much longer than their real names, and (many times) don't include any part of their names. It's just our terms of endearment for our kiddos!
Caleb has gone by Ca-Bug, Bug-a-Boo, Bug, Buggy, and Connor has always called him Boo-Boo.
Connor started out Con-Man, but also gets called Con-Bon, Connor-my-Bonnor, Bon-Bon, and (here lately) Stink Pot!
They both have so many "nicknames" it's not even funny - but it is because they know exactly who we're talking about!
*I just noticed how my C kids end up with B-ish nicknames!*