Where does “Purana” come from?

Purana comes from Sanskrit पुराण, meaning ancient or of old times.

Ancestry of “Purana”, step by step

Step	Language	Word	Meaning
1	Sanskrit	पुराण	belonging to ancient or olden times, ancient,...
2	Sanskrit	-न	forms nouns from roots
3	Latin	-nus	-an
4	Proto-Italic	-nos	—
5	Proto-Indo-European	-nós	Creates verbal adjectives from roots

Purana — Etymology, Origin & Word History | Etymology Explorer