by Jim Young (guest)
5/22/2011, 6:36 AM
The prefix becomes a 'B' with names beginning with an a vowel - Bedward, Bellis, Beynon, Bowen; a P with names beginning with an H or an R - Parry (Harry), Penry (Henry), Pugh (Hugh), Probert, Probin, etc.
Names beginning with other consonents don't appear to have retained the prefix in any form.