Where does “Alvalade” come from?

Alvalade (Portuguese) comes from Arabic بَلَد, from Arabic ل, from Proto-Semitic *lV- — for, to.

Ancestry of “Alvalade”, step by step

Step	Language	Word	Meaning
1	Arabic	بَلَد	—
2	Arabic	ل	to, for, belonging to; لَـ •; Used to express...
3	Proto-Semitic	*lV-	for, to