Pein (German) comes from Middle High German pīne, from Old High German pīna, from Latin poenā, from Ancient Greek ποινή, from Proto-Hellenic kʷoinā́, from Proto-Indo-European kʷoynéh₂, from Proto-Indo-European kʷey- — to pay; to avenge.
Pein (German): torment; agony; pain