The other thing you have to remember is that those who have nefarious intent don’t advertise it prior to their actions. Those who MAY have been born in the US will have birth certificates, phony records, etc. But will have, normally, taken the name of someone who had died at approximately the right age......Old trick, and one which takes digging to find. The other thing to remember is that Muslim men do not easily relinquish their claim on family. They believe that they have the right to “rule the roost”. The other thing to think about is that the name Mac Beth? Scotch/Irish in origin, if taken as a whole, yet the name Mac means “Son of” while Beth means “House”, so Mac Beth could mean “Son of the House”. The only question is which house. Remember, his father was Arabic, and surnames are VERY important in that culture, though not having the same meaning in our culture. Most surnames in Arabic culture reflect “son of....” or “daughter of....”