Where does “Londres” come from?

Londres (Portuguese) comes from Old Portuguese Londres, from Latin Londinium, from Proto-Celtic *Londinyom, from Proto-Indo-European lendʰ- — land, heath; loins.

Ancestry of “Londres”, step by step

Step	Language	Word	Meaning
1	Old Portuguese	Londres	—
2	Latin	Londinium	London
3	Proto-Celtic	*Londinyom	—
4	Proto-Indo-European	lendʰ-	land, heath; loins

Every word from Proto-Indo-European lendʰ- →

Londres — Etymology, Origin & Word History | Etymology Explorer