I have wondered about the Harlow name, too. Clarissa's parents were John and Barbiry Kyser, who came from Holland. Unfortunately, I have not found Barbiry's maiden name. I suppose you know that Clarissa had a brother, Christopher, b. 7-1818.
I am descended from daughter, Dora Clara Bailey and John King Graves, their son Sam Graves who m. Nettie Hayes, and their daughter, Lucille Graves who m. Newell Ford (my parents.)