Rebecca Galloway lived at Old Chillicothe in the Ohio Valley, which apparently was the "capital" settlement of the Shawnee. Old Chillicothe is called Old Town now. The Galloway family cabin is still there as a historical site maintained by the Greene County Historical Society. There's a picture here.

Perhaps Keelaghan saw it somewhere splled with one l, place name spellings tended to be somewhat fluid in older days.

[in modern days too - I wonder where Wondser Ontario is - just kidding Clinton]