What's in a town name?...

This from the Place Names of Kent by Judith Glover:
Tonbridge (Pronunced Tunbridge)
Farmstead bridge: bridge beside a farmstead (OE tun brycg - Tonebridge 1086 - Tonebrigga c1100 - Tunbrigg 1206 - Tunbridge 1610)

There were also some odd looking accents over letters, presumeably to tell us how to pronounce parts of the name, but let's not complicate things. So you see there's further evidence that there's no point in worrying about whether Tonbridge should have a "u" or an "o" because the name has changed gradually and evolved over the years anyway. Maybe in another 400 years it'll be called something else like #townofbridgesonahill