Some scientists theorize that we all have a doppelganger somewhere. This theory is a reasonable one in my opinion as several times online I have read about groups of people who travel the world with their double.
Many years ago when I was in the Royal Air Force, I had a pen friend in New Zealand, and she told me one of the local newscasters was the spitting image of me.
I have personal experience of lookalikes; on several occasions, I have passed a person I thought I knew and said "hello" only to get ignored. Then to pass what I thought is the same person a day or two later and decide not to speak, only for a friend to ask "why didn't I talk to them when we met on the street?"