I have started a Pearsall Family DNA - Surname Project.
Through genetic genealogy (e.g. testing specific markers on the Y-chromosome), we can learn more about:
1. When two family members shared the same ancestor, 2. How different branches of the Pearsall family are related (in the U.S. and worldwide), and 3. How different surnames are related - such as Pearsall, Parshall, Piersall, Parcells, Purcell, etc.