Even the name "Spanish" flu is because of denials from other nations:

The outbreak did not originate in Spain,[49] but reporting did, due to wartime censorship in belligerent nations. Spain was a neutral country unconcerned with appearances of combat readiness, and without a wartime propaganda machine to prop up morale,[50][51] so its newspapers freely reported epidemic effects, making Spain the apparent locus of the epidemic.[52] The censorship was so effective that Spain's health officials were unaware its neighboring countries were similarly affected.[53] In an October 1918 "Madrid Letter" to the Journal of the American Medical Association, a Spanish official protested, "we were surprised to learn that the disease was making ravages in other countries, and that people there were calling it the 'Spanish grip'. And wherefore Spanish? ...this epidemic was not born in Spain, and this should be recorded as a historic vindication."

https://en.wikipedia.org/wiki/Spanish_flu

I don't think we can convince people to remember it as the more accurate "1918 flu", so maybe the "not-spanish flu"?