Possibly we are dealing with the same family as the: Jennifer (Jane) Rounsaval, born 15 Dec 1789 St. Breock, Cornwall, England. She married John Gummow in 1803 in Cornwall. He was born 7 Feb 1799 St. Columb Major, Cornwall, the son of Richard Gummow, b 1731 St. Minver, Cornwall and Elizabeth Jenking, died 1810 St. Columb Major. They moved to America and died in 1859 and 1853, respectively, in Queen's Run, Clinton County, Pennsylvania.
I have no ancestry or authorities for Jennifer (Jane) Rounsaval and would be very grateful for any help I can get.