This enslaved ancestor's profile has a preliminary Last Name At Birth (LNAB) until a surname can be determined. Please see the US Black Heritage Naming Conventions for Slaves before merging or changing the LNAB.
In the inventory of Priscilla Jamison's estate, these people might be Ned's family members referred to in Samuel Jamison's will:
Polly, 38
Grafton, 20
Leonard, 16
Sources
↑ "Maryland Probate Estate and Guardianship Files, 1796-1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XKJK-9WX : 11 March 2018), Samuel Jamison, 11 Oct 1821; citing Allegany, county courts, Maryland.