Ok, why Bergerac, please? But, man, what a great link--thank you! Look:
Ancient Norman French continued in use in Jersey until at least the 1800's. Although the official written language was French, Jèrriais was spoken.
I wonder if Jèrriais would translate to "Jersey-ese"?
And isn't this neat:
La Société Jersiaise was formed in 1873 - their resolution was to study the history of the language and the island.

In 1908 Jèrriais was introduced into the Eisteddfod
What's the Eisteddfod?