I, too,am searching this Gantz family. My husband desc. from Frederick Gantz (1756-1825) and Catherine Keyser (1760-1800)to their dau. Catherine who married James Finley. I have a large file of Gantz records from PA & MD, but sorry no Leah. To comment, my records show that George Gantz who married Elizabeth Hartman died 19 Aug 1833 Mt Joy, Lancaster Co PA. As a clue to this Gantz line, when James & Catherine died 1815 in Baltimore, Adam Gantz was appointed their children's guardian. There must be a connection, but I haven't been able to tell what.