[1][2] Its nearest town is Waterlooville, approximately 4.5 miles away.

The last element of this name is the Old English word denu ("valley"), but the origin of the first is less obvious.

However, the same charter and others indicate that the inhabitants of the area were called cittanware and citware.

Again, the second element of this word is obviously an Old English word, this time ware ("inhabitants"), and the name suggests that cittan was an independent place-name in its own right.

Although the name Cittan has not been satisfactorily explained, several scholars have taken it to begin with the Common Brittonic word that survives in Modern Welsh as coed.