The name Ellison may be John Ellison, died 1829 in Manchester, Adams County. He was the husband of Anna Barr, who was the dau of Samuel Barr and Margaret Robinson, as well as the mother-in-law of Jane Sterrett (Jane Sterrett's husband was John Thompson Barr, brother of the above Anna). John Thompson Barr is also supposed to be buried in that cemetery, but I couldn't find any record of it. Jane Sterrett is the daughter of Benjamin Sterrett and Peggy Bell, and the granddaughter of Alexander Sterrett and wife Mary; i.e. your Sarah Sterrett was Jane's father's sister.