Durza:Actually, many Bretons have British names
Which British culture are we talking about here? There are eight. I presume you mean Lowland Scots and English?
Fido Gladstone:The Breton people in TES are based off the Breton people in real life, as in the descendents of the Celts/Ancient Britons and Gauls, therefore it is safe to assume that all the names would either be English names (having come from Great Britain)
Britain isn't England, and the Bretons in real-life are Celtic, whereas the English aren't. So the Bretons aren't based on the English, that's for damn sure. The real-life Bretons came from Cornwall and Wales after the Saxon conquest of England, and stopped leaving Cornwall and Wales after the foundation of Britain by Scotland. So the Bretons in the game, having made no real migration, may not be based on the Cornish and Welsh, either.
or French names (having come from Brittany in Northern France)
Bretons are not French, they're an entirely different culture, language, ethnic group, and people. Why they have French names is just laziness on the part of the devs.
Gez:They are in part. The real Bretons had regional clans, regional names, bardic legends, and local tribes. As do the Bretons in TES.
I can speak every Celtic language, one of them natively
aozgolo:Dunmer however, especially tribal Dunmer appear to possess very complex names with multiple syllables, and they sound very middle-eastern to me, though I can't really put my finger on where
I think it's Phoenician or Assyrian.