Hello,
My surname is one of most common's in Spain. Garcia. It's common but not ordinary. One king was called Garcia in Middle Ages in Spain, but as a first name, not surname. My first name is usual too, Miguel. So I bet, many people in Spain have my name. In fact, I know people that have the same name than my, for exemple the father of a school friend of my son. And both then, have the same surname, but fortunately, not the same first name.