Where does “nap” come from?

nap (Old Catalan) comes from Latin nāpus, from Ancient Greek νᾶπυ, from Demotic snwpt.

Ancestry of “nap”, step by step

Step	Language	Word	Meaning
1	Latin	nāpus	—
2	Ancient Greek	νᾶπυ	mustard
3	Demotic	snwpt	—