Why is it der Riemer?

Riemer 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] Craftsman who produces straps and other leather dishes

[1] Handwerker, der Riemen und sonstiges Ledergeschirr fertigt

Examples

[1] The Riemer can only repair the belt tomorrow

[1] Der Riemer kann erst Morgen den Riemen reparieren.

Declension

1 Singular Plural
Nominativ der Riemer die Riemer
Genitiv des Riemers der Riemer
Dativ dem Riemer den Riemern
Akkusativ den Riemer die Riemer

Pronunciation

Dictionary entries include material from Wiktionary. Wiktionary