Where does “πνεῦμα” come from?

πνεῦμα (Ancient Greek) comes from Ancient Greek πνέω, from Proto-Indo-European pnew- — to pant, breathe.

πνεῦμα (Ancient Greek): air; wind; breath

Definitions

Step	Language	Word	Meaning
1	Ancient Greek	πνέω	I blow; to breathe; 458 BCE, Aeschylus, The...
2	Proto-Indo-European	pnew-	to pant, breathe

πνεῦμα — Etymology, Origin & Word History | Etymology Explorer