Where does “Lahore” come from?

Lahore comes from Urdu لاہور, which derives from Sanskrit लवपुरी, ultimately from Sanskrit लव.

Ancestry of “Lahore”, step by step

Step	Language	Word	Meaning
1	Urdu	لاہور	—
2	Sanskrit	लवपुरी	—
3	Sanskrit	पुरी	fortress, castle, town; name of a town; the...
4	Sanskrit	पर	other; more remote; distant, further, other
5	Proto-Indo-European	per-	before, in front; first; to go through
6	Proto-Indo-European	pr̥tós	passed , crossed