On an interesting addendum to that, 23 and Me is an excellent DNA testing service, we got 50% off a 2nd analysis and my wife submitted it back in January 2020. They dont ask where the individual is from/what their heritage is, and it came back PRECISELY what her family has always known: 66.5% Bengal/West Bengal State, 23.5% Uttar Pradesh/Rampur and about 10% Patna/Bihar district all in India. They are extremely accurate with both mitochondrial DNA and y-chromosome from the paternal side.

What makes it even more amazing is that her family left India in 1903 for Guyana. So there is no way for 23 and Me to have known that.