Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
BENYON
As described in historical dictionaries
Patronymica Britannica (1860)
BENYON. Ab Enion, "the son of Enion,'' a Welsh personal name. See remarks under Bunyan, Pinion, and Onion.