I found that around the terrible year 1391 were all jewish people into Spain were obligate to change into christianism (among other terrible things) jewish change completely their names to a christian form.
I saw this on a large converter name's archive were was compared the old (jewish) and the new (christian) name >from people >from Girona, Barcelona and many other important places into Catalonia.
Actually into Spain a lot of descendents (my case, for example) still having the jewish surname.
