From the Beeb: Adoptees use DNA to find surname.
Male adoptees are using consumer DNA tests to predict the surnames carried by their biological fathers, the BBC has learned.
They are using the fact that men who share a surname sometimes have genetic likenesses too.
By searching DNA databases for other males with genetic markers matching their own, adoptees can check if these men also share a last name.
This can provide the likely surname of an adoptee’s biological father. [continue]