The river Derwent derives its name from the British *deru|ent|io with the root *deru meaning oak. The name was transferred to Malton (Derventio) in Roman times. It is interesting to find a similar sounding root in Deira, Derawudu and Derafeld.

Cataractonium from British *catu|rat|on|ion - battle ramparts.

Eburacum British *Ebur|acon from *Eburo - yew, thus the place of the yews. As early as 237 CE the city is given the badge of a boar which might explain its Old English name, Eoforwic 'boar town'.

Calcaria Latin 'lime-works'.

Danum contains *da 'flowing, liquid' a name for the Don. Nennius calls the town 'Cair Daun' hence the English Doncaster.