Note sure if you still working in this as just now found it on forum and thought might mention following information found page 24-25 of Pioneers Wiregrass Georgia by Folks Huxford...(noted you've seen some of his works)
Text listing as follows:
ALLEN, Isaac 1778-1851 of Thomas Co GA Early settler of Thomas Co GA born NC FEB 10, 1778 son of Lyddall Allen and wife Milly L Downs and grandson of Charles Allen Sr RS..Family had moved into Laurens Co GA at close of REV WAR... Isaac was wed twice but only his second spouse if named in text as Esther Harrell born DEC 13, 1801 daughter of Levi Harrell RS..she died in 1882 (text has full date for her death but lost that page (25) at this time only have part of the information on them... from here on out.. Test does note that Levi Harrell RS was from Barnwell SC area and I've located his estate papers from there and have copies of them. Also indicates he was in Telfair Co GA as well as Irwin but this may not have involved him moving from one place to other as Georgia today has 159 counties and many early family were simply moved when they formed a newer county or adjusted a county line between counties to get current county lines... Test lists Isaac and Esther children with their spouses but unable to at this time list spouses as that cut off on my copy of page 25..which lost the copy of entire page so will try and relocate it or get new copy.
1) Jane b 1818 2) Henry b 1823 3) John W b 1827 4) Noah b 1830 5) Elizabeth b 1832 6) Dempsey b 1834 7) Sarah Ann b 1838 8) Mary Adeline b 1840
Believe based on estate papers from Levi RS 1750-1806 that her mother was Miss Esther White as among the names of person filing on the estate of Levi RS/SR were Levi Harrell, JR (his son base as in estate papers a SR shows with the deceased name but no JR with the other Levi but other documents support Levi RS having son Levi born 1777, as Levi RS was witness and executor to 1787 will of Jacob Harrell indicating him as his son, and Jacob left the family land and house to grandson Levi Harrell but Jacob never names his spouse but indicates she is to have use of land and house until dead or rewed), Esther Harrell (his wife cleary indicated such in petition also among estate papers but not indicated as spouse in actual estate paper), also one Conrad Augley (he was from Barnwell area and may have followed the family to Pulaski Co GA area where young Levi Jr 1777 had moved with several siblings around 1804/5 and this area was Wilkerson Co GA then by 1807 Telfair and Pulaski by 1808 and Dodge by 1870 all locations for Harrell descendents of Levi RS...)
The name in the estate papers is clearly spelled Esther on one and seen as Ester on another and the name has also been seen as Hester or Hesther in some family listings related that if may have come into Harrell Family from such as Simmons who at least one of Jacob daughters Selah wed into and named a daughter usualy spelled Hester or Hesther...
Would like to hear from you on additional findings on the Allen Harrell links as trying to sort out who Levi Harrell RS wed and thus who the true mother of all the children he is said to father was...Current spources have been unverified to date and only say he wed Mrs Cole and Miss White.and assumptions have been made that it was Mrs Sarah Cole born 1756 in Albermarle then Miss Esther White after 1804..Still looking for their first names and if it fact he had two spouses at all as haven't yet found any marriage records on him....and all the sources I've seen simply list him Levi Harrell RS as a father of a child but never give the mothers name....
Again know it's been some time since you posted so hoping this reaches you....Thanks for any input you might have.