Why Did Glock Dub Its First Handgun the Glock 17?

It wasn't because it held 17 rounds in the magazine.

Glock 17: Respect the OG Wonder-Nine

Glock - Wikipedia

GUNS Magazine Lipsey's Reintroduces Original GLOCK P80 - GUNS Magazine

Custom Glock Slides Guide - 80 Percent Arms

Comp your 43x, it's worth it : r/Glocks

The Plastic Fantastics That Changed the Industry

Which is better, Glock 19 Gen 5 or Springfield Hellcat? - Quora

The 9mm Pistol: Dominating 120 Years of War and Peace

Docs vs. Glocks' legal battle ends

Glock, Black Flag Tactical Wiki