I do not have information on this William, But the date of his birth is about the right one for the parent of my GGF George Washington Mckee, who was born in 1816 in Marcellais, France. He was orphaned, then given the name of hid adoptive parents, Mckee. I do not know what state he was raised in. You indicate that William's widow listed some of her children's names on the pension application. Were any named George Washington? Or birth date 1/18/1816?