"First you can ask if people who are ethnically Greek White. The answer is yes to a great extent but not completely. Remember that in the history of the world wars were fought amongst diverse people. Countries were occupied by other people. In all these interactions, genetic material from one people were mixed with those of another. That is why you will find people of my ethnic background (Jewish) with blonde hair, or flat faces often resembling Mongolians and all in between. So is the same for ethnic Greeks.
In modern Greece you may have people who have immigrated from Africa, the Middle East, Europe, etc. So if they were born to parents from those countries they would be considered Greek because they were born in the Greece and are citizens at birth."