Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
RILEY
As described in historical dictionaries
Patronymica Britannica (1860)
RILEY. Probably derived from a place in Brittany, formerly called Rilley or Relay, the seat of an Abbey of Augustiniaus, in the diocese of Reunes. In the IJarish-registers of Newchurch, in Rossendale, CO. Lancaster, tlie name of the Rileys was almost uniformly spelt Rilaj', down to the middle of the XVI II. century. Inf. H. T. Riley, Esq.
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