Related: The demonym for Oxford is Oxonian, and the demonym for Cambridge is Cantabrigian (often shortened to "Cantab" or simply "Tab"). Bot demonyms are based on the Latin names: Oxonia and Cantabrigia respectively.
It's definitely used in other contexts. The main two that come to mind are the alumni email service (...@cantab.net) and the Cambridge MA (shortened to MA (Cantab.)).
I do occasionally hear it mispronounced as "Cantabridgarian".
There's a bar in Cambridge, MA called The Cantabridgian.
Also in the 80s there was a small computer company based in Cambridge, England called Jupiter Cantab. They made the Jupiter Ace computer, a semi-clone of the ZX81 with Forth in ROM instead of BASIC.
