[ANSTHRLD] Place name help - High Medieval Scotland

[Lynda Boots]

I am looking for documentation on the name of Dumbarton, Scotland, during the High Middle Ages (specifically 900-1054, during the existence of the Kingdom of Stratheclyde).  Also known as Al Cluth, Alquith, Arquith, Dunbarton, Dombroton, Dun Breatan.

Any help would be appreciated, as I'm trying to register my name, using this location as the byname.

Thanks.

Dreda