Where does “Valea lui Pătru” come from?

Valea lui Pătru (Romanian) comes from Romanian patru, from Latin quadrātus, from Latin quadrō, from Latin quādrus, from Latin quattŭor, from Portuguese quarto, from Old Portuguese quarto, from Latin quārtus — and.

Ancestry of “Valea lui Pătru”, step by step

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

via Romanian patru

Step	Language	Word	Meaning
1	Romanian	patru	four
2	Latin	quadrātus	square, squared, having been made square, made into a square shape
3	Latin	quadrō	to make four-cornered, square, make square
4	Latin	quādrus	square
5	Latin	quattŭor	four; 4
6	Portuguese	quarto	ordinal form of quatro; fourth; quarter; fourth;...
7	Old Portuguese	quarto	quarter
8	Latin	quārtus	fourth
9	Proto-Indo-European	kʷeturtos	—
10	Proto-Indo-European	kʷetwóres	four
11	Proto-Indo-European	kʷe-	and

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

Every word from Proto-Indo-European kʷe- →Every word from Proto-Indo-European kʷetwóres →Every word from Proto-Indo-European kʷeturtos →