Why is it der Kidnapper?

Kidnapper 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] Someone who has taken a person

[1] jemand, der eine Person gekidnappt hat

Examples

[1] The kidnappers are armed and violent

[1] Die Kidnapper sind bewaffnet und gewaltbereit.

Declension

1 Singular Plural
Nominativ der Kidnapper die Kidnapper
Genitiv des Kidnappers der Kidnapper
Dativ dem Kidnapper den Kidnappern
Akkusativ den Kidnapper die Kidnapper

Pronunciation

Dictionary entries include material from Wiktionary. Wiktionary