Brittany is a peninsula on the northwest coast of France. In the ancient world, it was known as Armorica. It acquired the new name as a result of a flood of Celtic immigrants who were fleeing the chaos caused by the arrival of the Angles, Saxons, and Jutes in Britain.
In ancient times, it was known as Armorica
Language and Culture
The native Celtic language of Brittany is Breton. It is one of the p-Celtic languages,
being closely related to Welsh and Cornish and more distantly related to the q-Celtic languages Gaelic, Irish, and Manx.
Kevarker is a site dedicated to Breton language and culture.
Brittany, both before the Celtic settlement that named it and afterwards, has had a long and interesting history. Wikipedia has a good brief introduction to the history of Brittany.