How can black people have white last names such as Irish names?

I'm not racist or anything PLEASE don't take it that way one of my best friends is black and she is very nice! But i mean like Shaquille O'Neal and i once knew a black boy in high school named Micheal Mckinney and another black boy by the last name of O'Brian. My friend and i were discussing this... show more I'm not racist or anything PLEASE don't take it that way one of my best friends is black and she is very nice! But i mean like Shaquille O'Neal and i once knew a black boy in high school named Micheal Mckinney and another black boy by the last name of O'Brian. My friend and i were discussing this the other day.
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