Mathematical statements and physics equations often are named after a person (like Pythagoras theorem or Newton's second law). Reading from different authors with different origins one may sometimes find a common statement with a different name. I have usually seen this in French and Russian sources, where Snell's law became Descartes' law and Gauss' theorem became Ostrogradsky's theorem respectively.
Is there a law/theorem well known for having many different names/authors depending on the language/region? I am looking for more than 2 names/languages/regions.