"Spanish Flu" was a propaganda name. Countries that were part of the World War One (Britain, Germany, France) didn't want to cause panic in their armies so manufactured news that most people sick from the flu were in Spain (which was not part of the war). They emphasized this theory by covering every case in Spain and not reporting about their own cases.
You know, kinda like "Chinese Flu" is currently used for propaganda? The whole point of using this name is to deflect blame and make public feel like "Chinese gave it to us, so everything that happens is all their fault".
Global pandemics do not have "nationality". This virus is no more Chinese than Swine Flu is "American". Do you know that Swine Flu started in the United States? Should we have called it "American Virus"?