Where does “Valea lui Dan” come from?

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

Ancestry of “Valea lui Dan”, step by step

Valea lui Dan traces back through 3 separate lines of ancestry.

via Romanian lui

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

via Romanian vale

Step	Language	Word	Meaning
1	Romanian	vale	valley
2	Latin	vallis	valley, vale; hollow; dative plural of vāllum
3	Proto-Indo-European	wēlH-	to roll, to undulate
4	Proto-Indo-European	welH-	to turn, to wind

via Romanian Dan

Step	Language	Word	Meaning
1	Romanian	Dan	—

Every word from Proto-Italic *olnos →Every word from Latin olle →Every word from Latin ille →