Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
BENION
As described in historical dictionaries
Patronymica Britannica (1860)
BENION. BENYON. Enion, an ancient Welsh personal name, prefixed by Ab, became Benion. So Barry, Bevan, &c.