Regarding the Dolberry surname, one must understand that Dolberry is the Americanized name of Delaberre. The Delaberre family was primarily in slave trading and owed only a few handful of slaves. This family was based primarily out of Mass. and the lineage was French, not Irish.
As for Dolberry ancestory in Ireland, I understand that most black Dolberrys passed for white in the 1800 and 1900's. These Black Dolberrys claimed their lineage to be Irish instead of Black. Many of them relocated to California and up north. I'm a Black Doberry from Philadelphia and I have heard of "white" Dolberrys who have lived in the area of Philadelphia. They even owed a diner named "Dolberry's" that caught on fire in the 60's or 70's. A elderly lady in California called my uncle years ago and said the Dolberry side of her family moved from down South to California and that she was told as a little girl that they were passing for white. My family came up to Philadelphia from Oak City, NC around 1930 by way of my grandfather, Claude Dolberry.