I said yes because three of them officially have a middle name.
Maggie Sue
Pepper Jack
Peanut Butter
Unofficially we have
Pervy poo
Pete Pete (we never say Pete just one time when we call him)
Stubby Girl
Sammy Boy
Leroy is really two names most of the time. You know, when we yell at him....LEEEEEEEE-ROOOOOOOOY

I guess poor Lucky is the only one that doesn't.