I am not researching these people, just entering information from one of my books "Landmarks in Ancient Dover, New Hampshire" by Mary P. Thompson:
"Jocelyn's Cove - mentioned Dec. 12, 1701, when 30 acres of land were laid out to Wm. Henderson, Sr. (granted March 19, 1693-4), beginning at a small white pine near Cornelius Courson's fence, on the south side of Josling's Cove.This cove is on the western shore of the Newichawannock, just above the bridge to Eliot.The name was no doubt derived from Henry Jocelyn, who was appointed Capt. John Mason's agent in New Hampshire in 1634.He was the son of Sir Thomas Josselyn, whom Sir Ferdinando Gorges appointed Deputy Governor of Maine in 1639.A list of the goods left with 'Mr. Joslyn' in the house at Newichawannock, Aug., 1634, is given in the N.H. Prov. Pap., 1: 93-94.He seems to have written his name 'Jocelyn.'Henry Jocelyn afterwards went to Black Point, Scarborough, ME. where he built a garrison, which, in spite of the viligance implied in Whittier's line, 'Grey Jocelyn's eye is never sleeping,' was captured by Mogg Megone or Hegone Oct. 12, 1677."
There are other listings in the index on this family.