Where does “คนบาป” come from?

คนบาป (Thai) comes from Thai บาป, from Pali pāpa, from Sanskrit पाप, from Proto-Indo-Iranian pāpás — bad.

คนบาป (Thai): sinner

Definitions

คนบาป traces back through two separate lines of ancestry.

Step	Language	Word	Meaning
1	Thai	บาป	sin; badness; evilness; bad; evil
2	Pali	pāpa	evil, sinful; a sin, bad deed
3	Sanskrit	पाप	bad, vicious, wicked, evil, wretched, vile, low;...
4	Proto-Indo-Iranian	pāpás	bad

Step	Language	Word	Meaning
1	Thai	คน	person; people; human being; to stir; to...
2	Proto-Tai	ɢwɯnᴬ	human being, person; human; person; human being;...