[jetunsaure]

Indeed, in many languages, even unrelated ones like Finnish, Greek, and Vietnamese, the word for moth is "night butterfly".

[hnbad]

In German the category of both is called "Schmetterling" which is also the German word for butterfly, which are technically called "Tagfalter" (day folders). Moths are called "Nachtfalter" (night folder) or simply "Motte" (moth), which technically refers only to specific smaller moths, especially pests.

[duchenne]

In French as well: "papillon de nuit"

[scns]

In german: Nachtfalter ie nightfolder

[brazzy]

The word "Falter" is not in fact etymologically related to "falten" (folding), according to Wikipedia: https://de.wikipedia.org/wiki/Schmetterlinge#Herkunft_des_Na...