Maybe there are cases where the original isn't Latin, but I've never noticed one, and French does not have many words of non-Latin origin. I'm not sure if English speakers commonly know that, but English is a rare case of thoroughly mixed origins.
Swedish word for it is strikingly similar, but with a hint of being more "hip and trendy restaurant in gentrified neighborhood": Fönster.
Like with any word, it's use in colloquial form may vary from generation to generation, from subculture to subculture etc
https://en.wikipedia.org/wiki/Defenestrations_of_Prague
And if you believe Wiki, it was used originally in Middle French.