Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
RAINES
As described in historical dictionaries
Patronymica Britannica (1860)
RAINES. I. An old spelling of the town of Rennes, in Brittany. 2. But the Raineses of Essex, Yorkshire, and Sussex, descend from Roger, a companion in arms of William the Conqueror, who rewarded him with lands at Rayne in Essex and elsewhere. Hence he and his posterity acquired the name of De Raines, or Raneis. Morant's Essex.
Origin: English
Region of origin: British Isles
Country of origin: England
Religion of origin: Christian
Language of origin: English