The aim of this Project is to study the surnames Hadrill, Haddrell and other variant spellings, primarily through DNA testing of the Y-chromosome carried by men who inherited the Hadrill (etc.) surname and DNA on the direct male line. Other people with an interest in these names are welcome to join but their DNA results will not be displayed on this site. For more details about DNA tests, the Y-chromosome, variant spellings and who can join, see the FAQs.