> Major outbreaks are regularly named based on their origin: Spanish Flu,

Major outbreaks _were_ named like that, but as the other reply pointed out, the "Spanish Flu" did not actually originate in Spain at all.

It is for reasons like that, that WHO best practices now specifically say to not name diseases this way: https://www.who.int/news/item/08-05-2015-who-issues-best-pra...

> Terms that should be avoided in disease names include geographic locations, people’s names, species of animal or food, cultural, population, industry or occupational references....