The Bug and the Moose

My Bug is coming to visit this weekend. Bug is my cousin, Evan. The first time I saw him, I started calling him Bugaboo. It's become Bug.
Evan will be a big brother in a few months. His little brother, Drew, is due in January. I was planning on waiting until seeing him for the first time before coming up with a nickname, but for some reason, the name Moose has been sticking in my head. I mentioned this to Bug's mama yesterday, and her response was, "You can't call my child Moose!" To which I replied, "But I can call your child Bug?"
She hasn't answered me back.