Regarding David Scriven's post, I would say that in my experience
throughout Galicia (and probably the Ashkenazi world) the naming of
children after deceased ancestors was universally prevalent. It also
meant that there may have been siblings and children with the same
first name, if they were named after an earlier ancestor. So whilst it is
tricky for genealogists, it also points you in the right direction.
Whether the converse is true, I cannot say.