Don't know how much of this you already know... On Page 46 of the Pennsylvania Archive (S.Hazard et al) County of Philadelphia 1769, Douglas Twnshp Tax assesment... Jacob Arney 100 acres, 1 horse, 2 cattle, Tax 7.6.8
New Jersey Colonial Documents pg 660 Jacob Arney witnessed marriage of John Jones of Merrion, Phil. cnty (son of Edward) and Mary Doughty of Crosswicks, N.J. on 12th 9th mo. 1717
same page a Joseph Arney was witness to a marriage in 1731
Not sure which Jacob Arney these might be, if they are the same being 50 years apart, but maybe it's helpful.