rbowman wrote, on Tue, 08 Dec 2015 20:02:08 -0700:
Just so you understand the etymology, it never started with Bayerische.
It started with Beeser (as in BSA) motorcycle racers.
When BMW started bike racing in the UK, they called 'em "beemers".
Then, when BMW started selling cages in the USA, they called the cages "beemers".
So, the etymology has absolutely nothing to do with Bayerische.
NOTE: It's all in the millions of articles on the same topic, since this is the very first thing any BMW owner learns, even before learning Disa and Vanos and CCV, etc. (which every BMW owner also knows well).