This is named, in common with most of the roads on this Harnham estate, after an English county. With the exception of Wiltshire Road, the other counties follow the South and South Eastern coastline: Sussex Road, Kent Road, Essex Square, Suffolk Road and Norfolk Road.
The word ‘Suffolk’ itself derives from Southern folk, as opposed to the Northen folk of Norfolk 1
[...] is on an estate which features all of the counties on the coastline from Norfolk itself, through Suffolk, Essex, Kent and [...]
[...] exception of Wiltshire Road, follow the coast line of south-eastern England – Norfolk Road, Suffolk Road, Essex Road, Kent Road and Sussex [...]