Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
ROBERT
As described in historical dictionaries
Patronymica Britannica (1860)
AP ROBERT. (Welsh). The son of Robert. Hence Probert. The name sometimes took the form of Robin, and hence Ap Robyn, Probjn.
Surname type: From given name or forename
Region of origin: Europe