Where does “Pârâul lui Adam” come from?

Pârâul lui Adam (Romanian) comes from Romanian lui, from Latin illūi, from Latin illī, from Latin ille, from Latin olle, from Proto-Italic *olnos — that.

Ancestry of “Pârâul lui Adam”, step by step

Step	Language	Word	Meaning
1	Romanian	lui	his; to him
2	Latin	illūi	him dative singular masculine; apparently also genitive
3	Latin	illī	found in
4	Latin	ille	that; those; "; demonstrative pronoun "; that...
5	Latin	olle	Archaic form of ille
6	Proto-Italic	*olnos	that

Every word from Proto-Italic *olnos →