His second name is Peter - so maybe it'll change to that eventually, but why do people have to choose such bizarre names - often to the detriment of the child?!
I feel old!
Yes - The nickname of Chesley Sullenberger (the pilot who safely landed his stricken plane on the Hudson River) - I guess with a first name like Chesley then Sully is an easier name!
That reminds me of when I was a kid and a French uncle came over to stay with us in England.
She was probably a "Dr Quinn" addict. Perhaps short for "Sullivan" ??