I have not researched the Morris line but I have read that he was a Quaker and I have seen the name in quite a few wills/probates, usually as testator or appraiser. Following is one in a line I am researching. This Isaac MAY have been the father of your Isaac. David Murray 15 September 1745w. 25 June 1746p. To daughter Esther Murray, livestock. To son William Murray, the lot in town, # 29 on the west side of Court house, which I purchased of John Martin, to be inherited after his mothers death. Isaac Morris to have my son till he is 21 years of age. Son Nathaniel Hopkins Murray, 60 square feet of land in Snow Hill Town, lot #16. Son Samuel to be bound to apprentice as soon a capable of labor. Son Samuel, livestock to be given at age 21 years. Land purchased of Mathias Nicholson, in Indian Town to be sold to pay debts. Wife (not named) EX. Wit; Henry Lowe, John Scarborough, Elizabeth Stevenson. Also see Ocean City LifeSaving Museum site for some history, as well as will abstracts, on the Morris family and mention of "Isaac"--search wills, Murray, then search(edit) page for Isaac Morris.