I went to a photo copy of the county will book pages referenced from your web site.
You can find the will book on line at familysearch.org go to tennessee probate records- browse- then Sumner County Tennn Wills Volume 1 page 313-314 it has "sensis"
It is clear Swithin was in Floyd county in 1810, I have photo-images of all the documents referenced below. The 1810 index is incorect it shows "Sevillien".
North Carolina Genealogical Society Volume 10 No 2 May 1984 William Doub Bennett page 103 (1776) Petition # 2 (signed by William Rainey, clerk of Capt Tates Company) Anderson, Andrew Anderson, Peter Stolkup, Swain
North Carolina Taxpayers 1679-1790 volume 2 Compiled by Clarence Ratcliff page 193 Stalkup Peter Orange 1779 Swain Orange 1779 Tobias Orange 1779 Wm Orange 1779
Abstracts of Land Entries Orange County NC 1778-1795 By Dr A.B. Pruitt page 85 Transcript of Entry Taker's Book for Orange Co. Recd Nov 29 1798 signed W Hill for the Secretary page 131 #1140 July 1 1779 James Burck enters 100 ac in orange co on Stony Cr, borders the land he purchased of Swithin Stalcop and runs down the creek, warrant issued Nov 8 1779.
North Carolina Genealogical Society Volume 11 No 4 Nov 1985 Ransom McBride List of Taxable Property in Orange County NC 1780 page 158 111 Walkup, Switin L210 21C
Orange County North Carolina Court Minutes 1777-1786 Book III by Weynette Parks Haun page 102 (1494 - folio 53) Nov Term 1784 The execution of a deed from Swaine Stalcup to James Burch was duly prov'd in open court by the oath of Thomas Love one of the subscribing Witnessess thereto and Ordered to be Registered
Orange County NC Deeds Vol. 2 Aug 1801-Feb 1803 by Laura Willis Published 1999 by Simmons Historical Publications Melber KY 42069 page 61 Deed Book 10 page 125 Deed form Swethin Stalcup to Philip Walker Indenture made this 22nd day of February 1788, between Swenthin Stalcup of Orange county and Philip Walker of the same county, for and in consideration of the sum of one hundred and seventy pounds in trade to him in hand paid, for a tract of land lying on the waters of Jordan creek, beginning William Love's corner and containing two hundred and nine acres. Test: William Love Connally Walker Swethin (X) Stalcup Deed was proven in open court and duly recorded this May term of 1802 John Taylor clerk
Virginia Washington county Personal Property and Land Book 1788 Book B Sept 6 Stalcup Swithin 1 white male 4 horse Washington county Personal Property and Land Book 1789 Book B 1790 Jan 27 Stalcup Swithin 1 white male 3 horse Washington county Personal Property and Land Book 1791 Book B May 27 Stalcup Swithin 1 white male Washington county Personal Property and Land Book 1792 Book B Aug 20 Stalcup Switon 1 white male Washington county Personal Property and Land Book 1793 Book B April 13 Stalcup Swithin 1 white male Washington county Personal Property and Land Book 1794 Book B April 22 Stalcup Swithin 1 white male Washington county Personal Property and Land Book 1796 Book B May 4 Stalcup Swithin 1 male
Floyd County was created from Fleming, Montgomery, and Mason Counties on 13 Deember 1799.
1810 Census Floyd county Kentucky Swithin Stalcup 1 male over 45 1810 census Floyd co Ky Staleup Sevillien 104A 18 (actual census shows the above)
According to tax lists and other offical records there were approximately 550 families living in Floyd County in 1810, Jonathan Mayo, assistant to Joseph Crockett, United States Marshal for the District of Kentucky, enumerated a the third decennial United States census of the county and on December 24, 1810, he certified and reported that he had enumerated a total of 3,485. Of this number 1,809 were white males, 1,561 white females, and 115 negro slaves. Below are given the names of the heads of families and or taxpayers as of year 1810, together with the number of slaves owned by each slaveholder. Stalcup, Swithin