The area has a large Puerto Rican (American) population. That is a common Spanish and Puerto Rican name. As a matter of fact I think my grandmother's mother's maiden name was Martinez. NY (1920's)by way of Puerto Rico (1840's), by way of Spain. No reason to start in Mexico. Plenty of red-blooded Americans right here with that name.
Yep.
Same thing in Lorain, Ohio.
He may as well be named John Smith.