Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
JOCELYN
As described in historical dictionaries
Patronymica Britannica (1860)
JOCELYN. Lord Rodeu's family are " of Norman origin, said to have come into England with William the Conqueror, and to have been seated at Sempringham, co. Lincoln, by the grant of that monarch." Shirley's Noble and Gentle Men.