That numbering convention though. That .22 is a 44 but if you get a 45 it’s a 9, so if you want a .45 you need a 21 or a 30 or a 36.
They're numbered sequentially. Sort of.
Gaston already held 16 patents when he took the notion to make a pistol. The G-17's locking block became his 17th patent, which is why it was called a G-17.
Which makes sense in Glock-stria because Glocks are all about efficient manufacture, so he didn't waste any resources researching a catchy model name.
But that established a pattern Glock never deviated from. The G-48 is called the G-48 precisely because it was the next new design after the G-47. And Glock spent exactly €0.00 test-grouping the name for the new model