Why is it der Litauer?

Litauer 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 Lithuania, a person from Lithuania, belonging to the Lithuanian people

[1] Staatsbürger von Litauen, aus Litauen stammende Person, zum Volk der Litauer gehörige Person

Examples

[1] Valdas is born in Lithuania

[1] Valdas ist gebürtiger Litauer.

[1] Around 22,000 Lithuanians live in Latvia.

[1] In Lettland leben etwa 22.000 Litauer.

Declension

1 Singular Plural
Nominativ der Litauer die Litauer
Genitiv des Litauers der Litauer
Dativ dem Litauer den Litauern
Akkusativ den Litauer die Litauer

Pronunciation

Dictionary entries include material from Wiktionary. Wiktionary