Yes, there are African Americans who derive their surname from a former owner, by choice after gaining freedom. There are also those who came by the name via the more common and difficult to control biological drive. In either case, a Blount or Blunt by any other name is one and the same family.
I am Native American Muskogee Creek through William Blount (1749-1800) of North Carolina. George Washington appointed then Senator Blount to the post of Governor of Indian Affairs East of the Ohio River. William had at least one Native American consort Elizabeth Antone. She was the sister of Coushatta Chief, Red Shoes. Before they came to Texas the Coushatta were known as Koasati. Anyway, Elizabeth gave birth to my 6th ggrandfather, William John Blount. His Indian name was Lafarthga and the Anglo Name was given by whites who said he looked so much like Senator Blount.
My Indian Blount was born in GA, lived in Alabama and wound up as Principle Chief of the Apalachicola Inidans of Florida. 1n 1834, he removed his people to Texas under the Blount Band Treaty of 1832.His tribal town in FLorida was Blountstown and the name is still on the State map. Chief Blount had at least five wives and perhaps more. One of these was half Negro half Creek named Nelly Factor. They had one child together named Allen Factor.
I know I have many cousins of Black-Indian heritage out there somewhere and say I hope we can meet some day soon. Oh yes, Cousin Allen Factor was a Buffalo Soldier.
All Texas,Florida,Alabama, GA Blount/Blunts with Native heritage or if you thing you might have a Red branch in your tree, I can give you finding tips that only culture understands. For example, Creek Indians name their children differently from the standard Anglo practice as do many Southeastern tribes. Our Children were not given a surname of the biological father.
Are there mixed blood Blounts/Blunts out there? You bet and no apologies necessary!