I wonder how the statistics would be for Eastern Europe. Orthodox Christians celebrate name days, it's a tradition that even the non-practicing Christians and a

I wonder how the statistics would be for Eastern Europe. Orthodox Christians celebrate name days, it's a tradition that even the non-practicing Christians and atheists usually follow, i.e. the day associated with the saint whose name you have, or just somehow associated with your name. If you give your child a unique first name, then they don't have a name day, so it's really uncommon to give them names outside the list of several hundred traditional ones (might be even a few thousand, given all variants). On the other hand, last names have much more variation. I would say at least half of the people I know are usually called by their last name.