Usually a last name for a bad ass Italian mafia group/family, although this name has some Latin/Spanish history to it the Italians took it over because they are badasses. You can see this name being used by many people such as doctors, lawyers, even restaurants for its amazing last name and history. Those who have this name most likely are blessed with pure godly charm powers and can get with anyone anytime.
Guy: Did you hear about the crippling porn addiction the frontera's have?
Girl: Yeah it must be genetic
Person: Man i just fucked a Frontera... Best shit ever
Friend: Oh homie they can get anyone they want