Hi I have a hamster, I just got him. I have given him a human name like Kevin but not. My SIL thinks its 1stly weird I have a hamster (I'm in my thirties) and 2ndly given him a human name.
SIL isn't pregnant but says I have taken a name way from her. She doesn't like Kevin but now I've used it she can never use it 
Apparently this is a common rule for names, I should have known this. I should have waited until I knew her baby names before choosing to use a name for anything other than a baby.
Aibu to have not known this was a thing and to have laughed.