pietarin is the singular genitive or singular genitive of Pietari.

PietariN

Norwegian Bokmål

St. PetersburgN

Kven – Norwegian Bokmåldict-fkv-nob/src/Prop_fkvnob.xml:2229Edit on GitHub Suggest

Case	Sg
Nom	Pietari / pietari
Gen	Pietarin / pietarin
Par	Pietaria / Pietarii / pietaria / pietarii
Ill	Pietarhiin / pietarhiin
Ine	Pietarissa / pietarissa
Ela	Pietarista / pietarista