I tried to send you a reply to your email but it bounced. I have an ancestor Robert FARISH born 1674 in Broom Park Cumberland, Eng. He was in Caroline County, Va. by 1700. Have 2 sons for him being John born 1695 in Eng. & Robert born 1700 in Va. In answer to your question, it would be possible for a few thousand people to descend from this Robert who was born in Eng. in a period of 300 years.
I'm interested in finding Robert's wife & the name of the ship he came to America on.
Ed Jones New Palestine, In.