middle name confusion

We were discussing how we use have middle names and last names to help distinguish us from other people with the same name as us and this is what resulted...

Me: "Aaron, what is your middle name?"

Aaron: "Chihuahua"

Me: "I think that is your nickname. Do you know your middle name?"

Aaron: "Chihuahua"

Another student: "I think he is trying to say Juan"

(As always, all names have been changed for safety reasons)