I am also a Sharpe, a descendant of Claude & Ruby and up until a week ago, I didn't know that Thomas Sharpe existed.
From what I can figure out Lemuel was a Native of New York, not Native American. I'm not sure why he would've written Native, but he did it on more than one occasion.
I know this post is quite old, but I'm hoping you will see it. If so feel free to contact me.