African American Probate Records
https://www.familysearch.org/en/wiki/African_American_Probate_RecordsFor the most part, besides being counted as chattel on tax, land deed, and slave schedules, African Americans were not counted as people until the 1870 census. Other records of interest would be church records, which notes people of color being allowed or dispelled from the church, etc., but they are not always given a surname. Sometimes they are noted by their first name and "as belonging to "X" slaveowner." Therefore, African American researchers are very dependent upon getting information from the slaveowning family's documentation.