So much separation between the surname ‘García’

Hello everyone,

I’m British so forgive me if my Spanish is a bit bad, but one other thing, congratulations on the win 😂 you deserved it.

Here above you will see a map of the regional frequency of the surname García. Since it is the most common surname in Spain (I think) I started looking for how many people have that surname, after having searched for my surname.

But my question is, why aren’t there so many Garcias in Aragon, Catalonia, Rioja, and I don’t know the other regions 😂. But that’s all? Is there a reason for that?

Thanks in advance!