I don't know if there is any relation, but yours is the first Mohr in Baltimore that I've come across. In my family there was a Mary Mohr who married Heinrich O. Stintz in the late 1800's. (He was from Hamburg, Germany.) They lived in the Patterson Park area & then on Maple Avenue. Also in Baltimore in the late 1800's/early 1900's was a Kate Mohr who married John Lassohn, Jr.Sorry I don't know if related.