Why is it der Genfer?

Genfer 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] Residents of Geneva, someone who comes from Geneva

[1] Bewohner von Genf, jemand der aus Genf stammt

Examples

[1] My neighbor is a native of Geneva

[1] Mein Wohnungsnachbar ist ein gebürtiger Genfer.

Declension

1 Singular Plural
Nominativ der Genfer die Genfer
Genitiv des Genfers der Genfer
Dativ dem Genfer den Genfern
Akkusativ den Genfer die Genfer

Pronunciation

Dictionary entries include material from Wiktionary. Wiktionary