John Hart of Amwell signed the Declaration of Independence. Also the Hunterton County marriage records list his name as P. Johnson. In the 1850 Census for the City of Easton, Northampton Co, Pa, Johnson Godown is listed on Page 166. Jane is listed as being born in Penn. The age fits so I have recorded Jane as Johnson daughter.
More research is needed.
John McPherson Godown was born March 25, 1832. The 1850 census records for Easton, Northampton Co, PA records her with parents of Johnson and Hannah. The first name may be spelled wrong since the writing is hard to read. She is also flagged as having attended school within the year.