Is it der, die or das Surfer? – der Surfer, plural die Surfer

Why is it der Surfer?

Surfer ends in -er, and most nouns ending in -er are masculine: in a German dictionary, 86% of them take der.

Sense 1

der

[1] Wave rider

[1] Wellenreiter

[2] Windsurfer

[3] Someone who (mostly privately) is on the Internet (web)

[3] jemand, der (meist privat) im Internet (Web) unterwegs ist

[1] This beach belongs to the surf
[1] Dieser Strand gehört den Surfern.

[2] The quarry lake was full
[2] Der Baggersee war voller Surfer.

More source examples (1)

These dictionary examples can include historical and less common uses.

[3] With this site, a surfer rarely comes by
[3] Bei dieser Site kommt nur selten einmal ein Surfer vorbei.