I descend from the Heffelfinger family. I have traced my line back to Pennsylvania when in 1740 Martin Heffelfinger entered the port of Philadelphia. His son Martin took an oath of allegiance during the American Revolution. I know from Pennsylvania, the Heffelfinger families migrated to Ohio, Indiana, and Minnesota. During the Civil War there were Heffelfinger soldiers in PA, OH and IN for example.
Good luck in your search.
Regina