how i see it is that i lived in a town called Rugeley, this comes from RidgeLea that was the "ridge" as in the hill and the "Lea" as the valley. could Langley be based on the same thought as in the "Long Valley" i don't know the landscape there?
Langney - a likely derivative of Count of Eu. Sewal d'Langehers, the 12th Century owner of the Netherfield Hundred, an ancient county which became known as Sussex.