Just an update, since we have results from DNA kits with FTDNA, Ancestry.
My Y-DNA Haplogroup is G-L640 (FTDNA Y-111). Now awaiting the Big-Y upgrade.
My DNA matches to a large number of USA Blackburns, most of who date back to a very early emigre from Ireland. It does not match to most other Blackburns in Norfolk, and for the most part, not to most Blackburns in Lancashire and Yorkshire.
The ethnic analysis does indicate possibly Norman, and definite Irish influences, as well as early Briton.
It is likely that our ancestor dates the Conquest, and the de Blakebornes that arrived with William. One of these was sent north to serve William in Lancashire. Later under King John, some of those northern Blackburns were sent in the service of the King to Ireland, during the hated redistribution of the estates. One of their descendants later emigrated to the USA at an early date. Others returned to England as the "Ireland-Blackburns".
Research is ongoing. DNA Matches in Ireland show a locus in Waterford, in the south, and in line from Belfast to the West Coast, in the north.
If anyone is researching these lines, please contact me.
We are now in the DNA Database of the BFA (Blackburn Family Association) in the USA, and in a number of related projects on FTDNA.
Gedmatch Number: T603274 Gedmatch Genesis Number: XZ6152104
DNA also on MyHeritage and Ancestry.
FTDNA "Big-Y" pending.