Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
DALE
As described in historical dictionaries
Patronymica Britannica (1860)
DALE. A valley. The medieval form was At Dale, softened afterwards to A'Dale, as often found in parisli registers of the XVI. cent., and widely renowned through the ballad of Robin Hood and AUin a'Dale. In the H.R. we find Dc Dale, and De la Dale.
Surname type: Location or geographical feature
Origin: English
Region of origin: British Isles
Country of origin: England
Religion of origin: Christian
Language of origin: English