Why is it der Iraner?

Iraner 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] Citizens of Iran

[1] Staatsbürger von Iran

Examples

[1] "On Thursday, France President Jacques Chirac had already made it clear to the Iranian at a meeting in Paris that Tehran had to objectively demonstrate the peaceful character of his nuclear program"

[1] „Am Donnerstag hatte bereits Frankreichs Präsident Jacques Chirac dem Iraner bei einem Treffen in Paris klargemacht, daß Teheran den friedlichen Charakter seines Atomprogramms objektiv nachweisen müsse.“

[1] "Once I tried an Iranian"

[1] „Einmal habe ich es mit einem Iraner versucht.“

Declension

1 Singular Plural
Nominativ der Iraner die Iraner
Genitiv des Iraners der Iraner
Dativ dem Iraner den Iranern
Akkusativ den Iraner die Iraner

Pronunciation

Dictionary entries include material from Wiktionary. Wiktionary