I've come across instances of of a German Jewish son having the same
forename as his father and it was invariably because
the family had to adopt a legal surname. The custom.in France and
parts of Germany was that father and eldest son had the same first
name, and I
believe that this was often imposed on Jewish name-adopters. I think
that it only happened at these watershed moments
and that the two men would generally go
on using their previous Jewish first names in private.family situations
.although not on official documents.
St Albans, UK
St Albans, UK.