I looked at the Freedman's Bank Record you found. Thanks so much. He listed a brother David Moore, which would have been my GGpa's name had GGpa carried his father's surname. James Henry Sparrow is listed as a free person of color (Black) in Beaufort County in the 1850 and 1860 census. He is shown as living with adults with his last name, but never his mother. I have not looked at 1870 there.
I am looking for Washington Keys as a youth. It is interesting that I received another reply yesterday regarding the Keys family which mentions his name. In addition, I received a message this morning from someone researching surnames asking whether I have found connections in Washington and Martin Counties. Prayerfully, someone will have a family Bible or other document(s) to pull all these threads together.