"...Peirce, Eli Harvey – (4th Ten) Born July 29, 1827, in Uwchland, Chester Co., Pa., to Robert and Hannah Harvey Peirce. His parens moved to Nauvoo in 1841 and were baptized March 27, 1842, by Joseph ...
Apparently George of Chester County, Pennsylvania (originally of Winscom in the county of Somerset in England) may have changed his name from Pearce (not Pierce) to Peirce in 1716.
There is another Peirce Family who settled in New England.