porvoon is the singular genitive or singular genitive of Porvoo.

PorvooN

Norwegian Bokmål

BorgåN

Kven – Norwegian Bokmåldict-fkv-nob/src/Prop_fkvnob.xml:2459Edit on GitHub Suggest

Case	Sg
Nom	Porvoo / porvoo
Gen	Porvoon / porvoon
Par	Porvooa / Porvoo^V / porvooa / porvoo^V
Ill	Porvoohoon / porvoohoon
Ine	Porvoossa / porvoossa
Ela	Porvoosta / porvoosta