Why is it der Osloer?

Osloer ends in -er, and most nouns ending in -er are masculine: in a German dictionary, 86% of them take der.

All nouns ending in -er
Sense 1
der

Meaning

[1] person who comes from Oslo or lives there

[1] Person, die aus Oslo stammt oder dort lebt

Examples

[1] The Osloer Merit and the Osloer Ove are proud of Norwegians to be

[1] Die Osloerin Merit und der Osloer Ove sind stolz darauf Norweger zu sein.

Declension

1 Singular Plural
Nominativ der Osloer die Osloer
Genitiv des Osloers der Osloer
Dativ dem Osloer den Osloern
Akkusativ den Osloer die Osloer

Pronunciation

Dictionary entries include material from Wiktionary. Wiktionary