Jul 20, 2013 · Today, there are roughly between 300,000 and 600,000 Irish-descendants living in Mexico City, and the Northern region of the country, where Irish last names such as Bay, Lamport, Byrne, Walsh, Foley, Hayes, and O'Leary are common, especially in the states of Sonora, Chihuahua, Nuevo Leon, and Durango.