A Puzzler

A man is walking past a hospital when he sees a physician in a white coat and a little girl coming toward him. As they come closer, he realizes the physician is an old friend whom he has not seen since their college days. They greet each other warmly and the friend says, "Since we last saw each other in college, I went on to medical school and I am now a surgeon at this hospital. I also married someone whom you don't know and have never met, and this is our daughter, Nancy." The man says to the little girl, "Nancy, you not only have your mother's name but you also have her brown eyes."