How do you write "nya" in Spanish?

I suppose, "ña".

me suena a nia
segun asi le hacen los gatos japoneses
cuando maullan a mi en todos los animes que he visto me suena a NIA  in english 'nea'
my dear greengoes friend to me it sound like ´Nea´
after watching several animes and japanese references on mcanime , el rincon del manga , veoh , crunchy roll and youtube. now if you tell me how to write that simply write the same NYA

españa=in english sound aspanya

and yes its ña

ня

Er... Nya is written nya in all languages. If you want to know how meow is written, that's miau.