"Dych chi'n mynd i'r Alban?"
Translation:Are you going to Scotland?
I've wondered that. Also, we've no record of the Brythonic language, bar a few names from the Roman period, but presumably there were different regional dialects? We do know that Pictish had diverged enough to be considered a separate language in Bede's time. Sadly, there's no record (as far as I know) of that, either.