Our girls have lots of nicknames. I think that's funny considering I hated nicknames when I was a kid. My mom thought she'd call me Mandy, but I wouldn't have any of it. I was Amanda Nichole Carnes- Self (I was trying to say that I was MYSELF, and not Mandy, whoever that was) Apparently I didn't quite understand the concept of nicknames.
As for Mazzie BooBear- Their Grandma and Aunt Julie came up with Mazzie. Anytime the girls do something and we don't know which one, Mazzie did it! We call Izzie, Isaboo, and we call Maddie, MaddieBear. So Mazzie BooBear is their combined name.