Spanish people have a name and two surnames. We retain our father's first surname and our mother's first surname in order to make up our full name. This is possible because women do not change their name when they get married, so everybody's name is the same all throughout their life.

But, to the point about natural names, I knew a girl at university whose father's first surname was exactly the same as her mother's first surname: "Luna", meaning "Moon". For whatever reason, they thought it would be a good idea to give their daughter the first name "Luna", to go with it all. So there she was on the class list: Luna Luna Luna.