Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
PROBUS
As described in historical dictionaries
Patronymica Britannica (1860)
PROBUS. An ancient personal name, borne by a Cornish local saint (not in the Roman calendar), after -whom the parish of St. Probus is named.