Quote Originally Posted by Sir Cloud
dude music is done by nobuo uematsu not nomoro. and ilfana's last name is gainsborough and Prof. Gast is Aeris' father. you see in their house at the snow town when you go to the security tv thing

It is still unknown (unless i am mistaken) that gainsborough is either gast's, ilfana's, or even elmyra's surname however i believe that it is indeed elmyra's judging by the fact that Elmyra adopted Aeris from a very early age. (unless Aeris just took on her parent(s) surname if she remembered it.)