Not exactly, Roberto. There are many Macias in Madrid and Barcelona now because of the 1960s emigration, but that is a modern fact. It is normal that big cities show a higher concentration of people with the same name, but that doesn't say much about the origin of the name itself. The interesting fact is that, other than Madrid and Barcelona, the places where Macias are found in greater proportion are the provinces in the Northwest (areas of Galicia and Leon) and Southwest (area of Extremadura and Western Andalucia) of Spain. As I said before, this is consistent with the fact that the name originated in Galicia/Leon area and then expanded to the South, when the Christians fighting the Arabs in the 10th-14th centuries used to occupy the new-conquered Southern land with colonists from the North.