Where does “Parais” come from?

Parais (Old French) comes from Latin paradīsus, from Ancient Greek παράδεισος, from Proto-Iranian paridayĵah.

Ancestry of “Parais”, step by step

Step	Language	Word	Meaning
1	Latin	paradīsus	—
2	Ancient Greek	παράδεισος	the garden owned by the Persian nobility;...
3	Proto-Iranian	paridayĵah	—