I think it’s very difficult to find some information about some family names on internet.
Some years ago, before the internet boom, I tried to do my family tree. It was impossible to find information about my great grandparents. Then I thought I had a strange name.
A result of this activity, I have created a facebook account. I found about 20 people with my family name. I was impressed. I couldn’t believe it. I met some of them, my brothers, my cousins. But, there wassome of them that I never met them.
In Spain there are very common surnames like Perez, Rodriguez, Gonzalez. So, the most popular names are mixtures of common names and surnames, Jose Perez, Luis Fernandez and something like that.