As a male Jackman he can participate in the Jackman Y-DNA Project to help determine how his test results of his paternal ancestors Y-DNA would compare to that of other Jackman Lines from Northern Ireland, Co. Devon, Eng., and the various lines in VA, PA, OH, etc. to see IF they share a common male Jackman ancestor.
You can read about this project and see the results to date and learn how to participateon my website:
www.PageY-DNA.OrgGWP