The older locality
The located primary records currently favor Allison / Allisons for the older locality. Modern South Carolina Department of Natural Resources material identifies the public access site as “Allisons (Ellisons or Poston) Landing,” preserving Ellisons as an official modern variant. The archive therefore avoids reducing the history to the categorical statement that “Poston was originally known as Ellison.”
The associated forms — Allison Landing, Allisons Landing, Ellison’s Landing, Ellisons Landing, and Poston Landing — are best handled as a layered place-name cluster connected to the same Great Pee Dee River access geography unless a specific source demonstrates that one of them was a legally distinct settlement.
Why the names matter
These variants connect the railroad-era Poston community to the older river and landing geography while preserving the spelling actually found in different record sets. Contemporary usage could continue to say “Allisons” even after Poston appeared as a railroad/station name, which argues against a simple one-date rename.
External reference: SCDNR Great Pee Dee River access materials.
Contextual External Sources
These links support the landing-name cluster and Great Pee Dee River access context that connects Allison, Ellison, and Poston.