I've been hearing the name spelt both ways since his name was released. This poll is here to find out what you think. Leave a comment and talk about it, but don't forget to vote!!
Personally I think its properly spelt Pein.
I've seen scans that say Pein, and other scans that say Pain.
It's not much of a big deal. =/
Ok...does it even matter? It all depends on what the translator thinks the name should be, it's not like anybody ever gets confused when they use either name. There isn't even anything to discuss, thread closed.