I need to decide what to call a fortified camp south of Carlisle, that is, what the people of Rheged in the early 7th C might have called it. It's known these days as Brougham; the Romans called it Brocavum (it was the base of Danubian numerii) but now we're a few centuries on. I know nothing of Brittonic etymology. However (because, y'know, I'm always willing to take a guess), going by the change of Eboracum to Ebrauc, perhaps Brauc or Broauc might not be too far off the mark. Thoughts?