Bretons hail from Brittany, France, and along with their close cultural relatives the Cornish and Welsh, speak a language derived from the Brythonic branch of the Celtic languages. In the later Elder Scrolls games; Bretons usually sport Gallic names which can be directly correlated to this real-world ethnic group. However, an exception would be in regards to ESII: Daggerfall in which many British-sounding names are used when referencing this race of humans. This may have been done due to the fact that the many of the Bretons were once inhabitants of the eastern portions of modern day England driven out during the Saxon invasions later to recolonise parts of modern Wales and Cornwall. "Breton" is a modern term used to describe the people of Brittany. The Romans (Imperials) often referred to the Celtic people of ancient Albion (modern day Great Britain) as Britons, and made little internal distinction between the Brythonic (Pictish and Brittonic, later divided into the Cumbric, Breton, Cornish and Welsh languages) and the Goidelic (today represented by Irish, Gaelic, and Manx) peoples.
The Romans also referred to modern-day France as "Celtica," and used the terms "Gallic" and "Celtic" interchangeably. The word "Kelt" or "Keltoi" was originally Greek, and meant "stranger" or "outsider."
The Celtic cultures--first evinced archaeologically in "The Hallstatt Culture," appears to have developed in the Vienna basin spreading throughout Western Europe some time between 8th to 6th centuries BCE (early Iron Age). Also of significance was the La Tene culture that developed in the area of modern Switzerland from circa 450 to the 1st century BCE. These cultures dominated Europe and could be found as far east as Turkey (the New Testament "Epistle to the Galatians" reflects as much ("Galatian" is cognate with "Gaul").
It should also be noted that
Forsworn characters have Pictish names.